Claims
- 1. A composite structure comprising:
- (a) two substrates, and
- (b) coated between said substrates a pressure-sensitive, normally-tacky, adhesive interpolymer which is the product of simultaneous polymerization of ethylenically-unsaturated monomers which comprise
- (1) from about 70 to 90 molar parts of monomers consisting of
- (a) 69-100 mole percent of an acrylic acid ester of at least one non-tertiary alkyl alcohol, the molecules of said alcohol containing 1-14 carbon atoms, the average being 5-12 carbon atoms,
- (b) 31-0 mole percent of at least one monomer selected from the group consisting of vinyl acetate, styrene, vinyl ethers, and alkyl methacrylates, the alkyl group having 1 to 14 carbon atoms, and
- (c) 10-0 mole percent of at least one monomer selected from the group consisting of acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, and N-vinyl pyrrolidone, and
- (2) from 25 to 5 molar parts of at least one alkenyl azlactone monomer having the formula I ##STR6## wherein R.sup.1 is hydrogen or methyl; R.sup.2 is selected from a single bond, --R.sup.3 --, or ##STR7## in which R.sup.3 is a substituted or unsubstituted alkylene group having 1 to 12 carbon atoms, and W is --O--, --S--, or --NH--; R.sup.4 and R.sup.7 are independently selected from a single bond, methylene, or substituted methylene having 1 to 12 carbon atoms; R.sup.5 and R.sup.6 are independently substituted or unsubstituted alkyl or cycloalkyl having 1 to 12 carbon atoms, aryl or aralkyl having 6 to 12 carbon atoms, or R.sup.5 and R.sup.6 taken together with the carbon to which they are joined forming a 5- or 6-membered carbocyclic ring or R.sup.5 and R.sup.6 each may be hydrogen when at least one of R.sup.4 and R.sup.7 is methylene; and
- (3) from 25 to 5 molar parts of at least one acrylic-functional carboxylic acid monomer selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, or an N-acryloylamino acid;
- said interpolymer exhibiting a glass transition temperature (Tg) of less than -15.degree. C., with the proviso that said substituting groups are unreactive with said azlactone ring and said monomers having been polymerized in a medium free of alcohol and other crosslinking agents capable of reacting with the azlactone ring.
- 2. A composite structure comprising:
- (a) two substrates, and
- (b) coated between said substrates a pressure-sensitive, normally-tacky, adhesive interpolymer which is the product of simultaneous polymerization of ethylenically-unsaturated monomers which comprise
- (1) from about 70 to 90 molar parts of monomers consisting of
- (a) 75-100 mole percent of an acrylic acid ester of at least one non-tertiary alkyl alcohol, the molecules of said alcohol containing 1-14 carbon atoms, the average being 5-12 carbon atoms,
- (b) 15-0 mole percent of at least one monomer selected from the group consisting of vinyl acetate, styrene, vinyl ethers, and alkyl methacrylate, the alkyl group having 1 to 14 carbon atoms, and
- (c) 10-0 mole percent of at least one monomer selected from the group consisting of acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, and N-vinyl pyrrolidone, and
- (2) from 25 to 5 molar parts of least one alkenyl azlactone monomer having the formula I ##STR8## where R.sup.1 is hydrogen or methyl; R.sup.2 is selected from a single bond, --R.sup.3 --, or ##STR9## in which R.sup.3 is a substituted or unsubstituted alkylene group having 1 to 12 carbon atoms, and W is --O--, --S--, or --NH--; R.sup.4 and R.sup.7 are independently selected from a single bond, methylene, or substituted methylene having 1 to 12 carbon atoms; R.sup.5 and R.sup.6 are independently substituted or unsubstituted alkyl or cycloalkyl having 1 to 12 carbon atoms, aryl or aralkyl having 6 to 12 carbon atoms, or R.sup.5 and R.sup.6 taken together with the carbon to which they are joined forming a 5- or 6-membered carbocyclic ring or R.sup.5 and R.sup.6 each may be hydrogen when at least one of R.sup.4 and R.sup.7 is methylene; and
- (3) from 25 to 5 molar parts of at least one acrylic-functional carboxylic acid monomer selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, or an N-acryloylamino acid;
- said interpolymer exhibiting a glass transition temperature (Tg) of less than -15.degree. C., with the proviso that said substituting groups are unreactive with said azlactone ring and said monomers having been polymerized in a medium free of alcohol and other crosslinking agents capable of reacting with the azlactone ring.
- 3. The composite structure according to claim 1 wherein said ethylenically-unsaturated monomer of component (1)(a) of said interpolymer is an acrylic acid ester derived from an 8-carbon alcohol.
- 4. The composite structure according to claim 1 wherein said monomer component of said interpolymer is selected from the group consisting of (1)(a) components 2-ethylhexyl acrylate, iso-octyl acrylate, and 2-methylbutyl acrylate, and (1)(b) component lauryl methacrylate.
- 5. The composite structure according to claim 1 wherein said alkenyl azlactone monomer component of said interpolymer is selected from the group consisting of
- 2-vinyl-4,4-dimethyl-1,3-oxazolin-5-one,
- 2-vinyl-4,4-pentamethylene-1,3-oxazolin-5-one, and
- 2-vinyl-4,4-dimethyl-1,3-oxazin-6-one.
- 6. The composite structure according to claim 1 wherein said acrylic-functional carboxylic acid monomer component (3) of said interpolymer is selected from the group consisting of acrylic acid, methacrylic acid, and N-acryloylaspartic acid.
- 7. The composite structure according to claim 1 wherein said acrylic-functional carboxylic acid monomer component (3) of said interpolymer is replaced by a precursor thereof.
- 8. The composite structure according to claim 1 wherein component (1)(a) of said interpolymer is iso-octyl acrylate, component (2) is 2-vinyl-4,4-dimethyl-1,3-oxazolin-5-one, and component (3) is acrylic acid.
- 9. The composite structure according to claim 1 wherein component (1)(a) of said interpolymer is iso-octyl acrylate, component (2) is 2-vinyl-4,4-pentamethylene-1,3-oxazolin-5-one monomer, and component (3) is acrylic acid.
- 10. The composite structure of claim 1 wherein the interpolymer is cured.
- 11. The composite structure according to claim 1 wherein R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 of said alkenyl azlactone monomer are substituted by one or more groups selected from alkyl having 1 to 12 carbon atoms, halo, cyano, ether, ester, keto, silyl, and sulfide, the carbon-containing substituent groups having up to 12 carbon atoms.
- 12. The composite structure of claim 2 wherein the interpolymer is cured.
Parent Case Info
This is a division of application Ser. No. 676,206, filed Nov. 28, 1984, now U.S. Pat. No. 4,619,867, which is a division of application Ser. No. 504,213, filed June 14, 1983, and now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
627947 |
Oct 1963 |
CAX |
1121418 |
Jul 1968 |
GBX |
Non-Patent Literature Citations (3)
Entry |
Sorenson, W. R. and Campbell, T. W., "Preparative Methods of Polymer Chemistry", Interscience: New York (1968) p. 209. |
Taylor, L. D., et al., J. Polymer Sci.: Polymer Lett., 9, 187 (1971). |
Heilmann, S., et al., J. Appl. Polymer Sci., 24, 1551 (1979). |
Divisions (2)
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Number |
Date |
Country |
Parent |
676206 |
Nov 1984 |
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Parent |
504213 |
Jun 1983 |
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