Richard G. Hansen

Person

Mahtomedi, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Silicone copolymers, methods of making, and articles
- Patent number 10,941,252
- Issue date Mar 9, 2021
- 3M Innovative Properties Company
- Hannah C. Cohen
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polyurethane-polyurea dispersions comprising hydrazine or hydrazide...
- Patent number 10,351,653
- Issue date Jul 16, 2019
- 3M Innovative Properties Company
- Yongshang Lu
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Silicone-polyether copolymers, adhesives and medical articles compr...
- Patent number 10,329,384
- Issue date Jun 25, 2019
- 3M Innovative Properties Company
- Richard G. Hansen
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Polyurethane aerosol compositions, articles, and related methods
- Patent number 10,160,864
- Issue date Dec 25, 2018
- 3M Innovative Properties Company
- Susan M. Endle
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polydiorganosiloxane polymide copolymers having organic soft segments
- Patent number 9,527,965
- Issue date Dec 27, 2016
- 3M Innovative Properties Company
- Audrey A. Sherman
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Polydiorganosiloxane polyoxamide copolymers
- Patent number 9,434,821
- Issue date Sep 6, 2016
- 3M Innovative Properties Company
- Charles M. Leir
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Polydiorganosiloxane polymide copolymers having organic soft segments
- Patent number 9,290,684
- Issue date Mar 22, 2016
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Copolymers with perfluoropolyether segment and multiple aminooxalyl...
- Patent number 9,279,035
- Issue date Mar 8, 2016
- 3M Innovative Properties Company
- Suresh S. Iyer
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Polydiorganosiloxane polyoxamide copolymers
- Patent number 9,206,290
- Issue date Dec 8, 2015
- 3M Innovative Properties Company
- Charles M. Leir
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Polydiorganosiloxane polyamide copolymers having organic soft segments
- Patent number 9,018,331
- Issue date Apr 28, 2015
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Copolymers with perfluoropolyether segment and multiple aminooxalyl...
- Patent number 8,907,046
- Issue date Dec 9, 2014
- 3M Innovative Properties Company
- Suresh S. Iyer
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Perfluoropolyether-containing compounds with oxalylamino groups
- Patent number 8,907,120
- Issue date Dec 9, 2014
- 3M Innovative Properties Company
- Yu Yang
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Polydiorganosiloxane polyoxamide copolymers
- Patent number 8,853,323
- Issue date Oct 7, 2014
- 3M Innovative Properties Company
- Charles M. Leir
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Methods of making polydiorganosiloxane polyoxamide copolymers
- Patent number 8,765,881
- Issue date Jul 1, 2014
- 3M Innovative Properties Company
- David S. Hays
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Adhesive compositions
- Patent number 8,691,391
- Issue date Apr 8, 2014
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Branched polydiorganosiloxane polyamide copolymers
- Patent number 8,653,216
- Issue date Feb 18, 2014
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Reactive liquid modifiers
- Patent number 8,637,614
- Issue date Jan 28, 2014
- 3M Innovative Properties Company
- Ilya Gorodisher
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Polydiorganosiloxane polyamide copolymers having organic soft segments
- Patent number 8,623,988
- Issue date Jan 7, 2014
- 3M Innovative Properties Company
- Audrey A. Sherman
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Moisture-curable siloxanes and siloxane polymers
- Patent number 8,614,281
- Issue date Dec 24, 2013
- 3M Innovative Properties Company
- Richard G. Hansen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Moisture-curable siloxane-containing compounds and fluorocarbon-con...
- Patent number 8,609,787
- Issue date Dec 17, 2013
- 3M Innovative Properties Company
- Richard G. Hansen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Polydiorganosiloxane polyoxamide copolymers
- Patent number 8,586,668
- Issue date Nov 19, 2013
- 3M Innovative Properties Company
- Charles M. Leir
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Copolymers with perfluoropolyether segment and polydiorganosiloxane...
- Patent number 8,552,124
- Issue date Oct 8, 2013
- 3M Innovative Properties Company
- Richard G. Hansen
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Multilayer films including thermoplastic silicone block copolymers
- Patent number 8,524,370
- Issue date Sep 3, 2013
- 3M Innovative Properties Company
- Karl E. Benson
- G02 - OPTICS
Information Patent Grant
Adhesive compositions
- Patent number 8,492,486
- Issue date Jul 23, 2013
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Branched polydiorganosiloxane polyamide copolymers
- Patent number 8,431,668
- Issue date Apr 30, 2013
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Polydiorganosiloxane polyamide copolymers having organic soft segments
- Patent number 8,361,626
- Issue date Jan 29, 2013
- 3M Innovative Properties Company
- Audrey A. Sherman
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Adhesive compositions
- Patent number 8,236,429
- Issue date Aug 7, 2012
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Branched polydiorganosiloxane polyamide copolymers
- Patent number 8,158,739
- Issue date Apr 17, 2012
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Silicone polyoxamide and silicone polyoxamide-hydrazide copolymers
- Patent number 8,124,713
- Issue date Feb 28, 2012
- 3M Innovative Properties Company
- David S. Hays
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Films including thermoplastic silicone block copolymers
- Patent number 8,067,094
- Issue date Nov 29, 2011
- 3M Innovative Properties Company
- Karl E. Benson
- B32 - LAYERED PRODUCTS

Patents Applicationslast 30 patents

Information Patent Application
SILICONE COPOLYMERS, METHODS OF MAKING, AND ARTICLES
- Publication number 20190263972
- Publication date Aug 29, 2019
- 3M INNOVATIVE PROPERTIES COMPANY
- HANNAH C. COHEN
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
SILICONE-BASED ADHESIVE COMPOSITIONS AND ADHESIVE ARTICLES
- Publication number 20190016935
- Publication date Jan 17, 2019
- 3M Innovative Properties Company
- DAVID S. HAYS
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
POLYURETHANE AEROSOL COMPOSITIONS, ARTICLES, AND RELATED METHODS
- Publication number 20170198150
- Publication date Jul 13, 2017
- 3M Innovative Properties Company
- Susan M. ENDLE
- B05 - SPRAYING OR ATOMISING IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATER...
Information Patent Application
POLYURETHANE-POLYUREA DISPERSIONS COMPRISING HYDRAZINE OR HYDRAZIDE...
- Publication number 20170174815
- Publication date Jun 22, 2017
- 3M Innovative Properties Company
- Yongshang Lu
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
SILICONE-POLYETHER COPOLYMERS, ADHESIVES AND MEDICAL ARTICLES COMPR...
- Publication number 20160215100
- Publication date Jul 28, 2016
- 3M INNOVATIVE PROPERTIES COMPANY
- Richard G. Hansen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
POLYDIORGANOSILOXANE POLYMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS
- Publication number 20160159987
- Publication date Jun 9, 2016
- 3M Innovative Properties Company
- Audrey A. Sherman
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Application
POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS
- Publication number 20160053057
- Publication date Feb 25, 2016
- 3M Innovative Properties Company
- Charles M. Leir
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYDIORGANOSILOXANE POLYMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS
- Publication number 20150197675
- Publication date Jul 16, 2015
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND MULTIPLE AMINOOXALYL...
- Publication number 20150057428
- Publication date Feb 26, 2015
- 3M Innovative Properties Company
- Suresh S. Iyer
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS
- Publication number 20140370243
- Publication date Dec 18, 2014
- Charles M. Leir
- B32 - LAYERED PRODUCTS
Information Patent Application
POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS
- Publication number 20140094584
- Publication date Apr 3, 2014
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS
- Publication number 20140050872
- Publication date Feb 20, 2014
- 3M Innovative Properties Company
- Charles M. Leir
- B32 - LAYERED PRODUCTS
Information Patent Application
ADHESIVE COMPOSITIONS
- Publication number 20130288053
- Publication date Oct 31, 2013
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS
- Publication number 20130225768
- Publication date Aug 29, 2013
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS
- Publication number 20130109828
- Publication date May 2, 2013
- 3M Innovative Properties Company
- Audrey A. Sherman
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
MOISTURE-CURABLE SILOXANE-CONTAINING COMPOUNDS AND FLUOROCARBON-CON...
- Publication number 20130012667
- Publication date Jan 10, 2013
- Richard G. Hansen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
MOISTURE-CURABLE SILOXANES AND SILOXANE POLYMERS
- Publication number 20130011673
- Publication date Jan 10, 2013
- Richard G. Hansen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
ADHESIVE COMPOSITIONS
- Publication number 20120295025
- Publication date Nov 22, 2012
- 3M Innovative Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PERFLUOROPOLYETHER-CONTAINING COMPOUNDS WITH OXALYLAMINO GROUPS
- Publication number 20120289736
- Publication date Nov 15, 2012
- 3M INNOVATIVE PROPERTIES COMPANY
- Yu Yang
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHODS OF MAKING POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS
- Publication number 20120271025
- Publication date Oct 25, 2012
- 3M INNOVATIVE PROPERTIES COMPANY
- David S. Hays
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND POLYDIORGANOSILOXANE...
- Publication number 20120264890
- Publication date Oct 18, 2012
- Richard G. Hansen
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND MULTIPLE AMINOOXALYL...
- Publication number 20120259088
- Publication date Oct 11, 2012
- Suresh S. Iyer
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS
- Publication number 20120175566
- Publication date Jul 12, 2012
- 3M Innovative Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS
- Publication number 20120027976
- Publication date Feb 2, 2012
- 3M Innovative Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS
- Publication number 20110263798
- Publication date Oct 27, 2011
- 3M Innovative Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
ADHESIVE COMPOSITIONS
- Publication number 20110189421
- Publication date Aug 4, 2011
- 3M Innovatives Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
REACTIVE LIQUID MODIFIERS
- Publication number 20110130518
- Publication date Jun 2, 2011
- Ilya Gorodisher
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS
- Publication number 20110123798
- Publication date May 26, 2011
- 3M Innovative Properties Company
- Audrey A. Sherman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS
- Publication number 20110092638
- Publication date Apr 21, 2011
- 3M Innovative Properties Company
- Charles M. Leir
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Application
SILICONE POLYOXAMIDE AND SILICONE POLYOXAMIDE-HYDRAZIDE COPOLYMERS
- Publication number 20110071270
- Publication date Mar 24, 2011
- 3M Innovative Properties Company
- David S. HAYS
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Richard G. Hansen

Person

Patents Grantslast 30 patents

Silicone copolymers, methods of making, and articles

Polyurethane-polyurea dispersions comprising hydrazine or hydrazide...

Silicone-polyether copolymers, adhesives and medical articles compr...

Polyurethane aerosol compositions, articles, and related methods

Polydiorganosiloxane polymide copolymers having organic soft segments

Polydiorganosiloxane polyoxamide copolymers

Polydiorganosiloxane polymide copolymers having organic soft segments

Copolymers with perfluoropolyether segment and multiple aminooxalyl...

Polydiorganosiloxane polyoxamide copolymers

Polydiorganosiloxane polyamide copolymers having organic soft segments

Copolymers with perfluoropolyether segment and multiple aminooxalyl...

Perfluoropolyether-containing compounds with oxalylamino groups

Polydiorganosiloxane polyoxamide copolymers

Methods of making polydiorganosiloxane polyoxamide copolymers

Adhesive compositions

Branched polydiorganosiloxane polyamide copolymers

Reactive liquid modifiers

Polydiorganosiloxane polyamide copolymers having organic soft segments

Moisture-curable siloxanes and siloxane polymers

Moisture-curable siloxane-containing compounds and fluorocarbon-con...

Polydiorganosiloxane polyoxamide copolymers

Copolymers with perfluoropolyether segment and polydiorganosiloxane...

Multilayer films including thermoplastic silicone block copolymers

Adhesive compositions

Branched polydiorganosiloxane polyamide copolymers

Polydiorganosiloxane polyamide copolymers having organic soft segments

Adhesive compositions

Branched polydiorganosiloxane polyamide copolymers

Silicone polyoxamide and silicone polyoxamide-hydrazide copolymers

Films including thermoplastic silicone block copolymers

Patents Applicationslast 30 patents

SILICONE COPOLYMERS, METHODS OF MAKING, AND ARTICLES

SILICONE-BASED ADHESIVE COMPOSITIONS AND ADHESIVE ARTICLES

POLYURETHANE AEROSOL COMPOSITIONS, ARTICLES, AND RELATED METHODS

POLYURETHANE-POLYUREA DISPERSIONS COMPRISING HYDRAZINE OR HYDRAZIDE...

SILICONE-POLYETHER COPOLYMERS, ADHESIVES AND MEDICAL ARTICLES COMPR...

POLYDIORGANOSILOXANE POLYMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS

POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS

POLYDIORGANOSILOXANE POLYMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS

COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND MULTIPLE AMINOOXALYL...

POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS

POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS

POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS

ADHESIVE COMPOSITIONS

BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS

POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS

MOISTURE-CURABLE SILOXANE-CONTAINING COMPOUNDS AND FLUOROCARBON-CON...

MOISTURE-CURABLE SILOXANES AND SILOXANE POLYMERS

ADHESIVE COMPOSITIONS

PERFLUOROPOLYETHER-CONTAINING COMPOUNDS WITH OXALYLAMINO GROUPS

METHODS OF MAKING POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS

COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND POLYDIORGANOSILOXANE...

COPOLYMERS WITH PERFLUOROPOLYETHER SEGMENT AND MULTIPLE AMINOOXALYL...

BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS

POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS HAVING ORGANIC SOFT SEGMENTS

BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS

ADHESIVE COMPOSITIONS

REACTIVE LIQUID MODIFIERS

BRANCHED POLYDIORGANOSILOXANE POLYAMIDE COPOLYMERS

POLYDIORGANOSILOXANE POLYOXAMIDE COPOLYMERS

SILICONE POLYOXAMIDE AND SILICONE POLYOXAMIDE-HYDRAZIDE COPOLYMERS