Claims
- 1. An isocyanate-functional polymer of at least 10% by weight of isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate, polymerized alone or with a polymerizable comonomer,
- any polymerizable comonomer being at least one member of the group consisting of alkyl acrylates and methacrylates; styrene; ethylene; vinyl acetate; and vinyl chloride,
- in the presence of 1-20% by weight, based on the weight of the polymer, of a mercaptan chain-transfer agent,
- wherein at least 10% by number of the polymer molecules have the following structure: ##STR5## where RS is the residue of a mercaptan chain-transfer agent, R-- being C.sub.4 -C.sub.12 alkyl, phenyl, benzyl or ##STR6## where R.sub.3 -- is C.sub.4 -C.sub.12 alkyl, phenyl or benzyl and m is 0-8;
- R.sub.1 is hydrogen or methyl;
- X is COO--A--NCO or a mixture of COO--A--NCO and at least one of ##STR7## where A is an alkylene group having 2-6 carbon atoms, and
- R.sub.2 is an alkyl group having 1-12 carbon atoms;
- and n is 2-400 so that the polymer has a number average molecular weight, determined by gel permeation chromatography, utilizing polystyrene standards of polydispersity less than 1.1, of 500-10,000.
- 2. A polymer of claim 1 containing at least one polymerizable comonomer of the group consisting of methyl, ethyl, butyl, hexyl, 2-ethylhexyl and lauryl acrylates and methacrylates, styrene, ethylene, vinyl acetate and vinyl chloride.
- 3. The polymer of claim 1 wherein the isocyanatoalkyl methacrylate is isocyanatoethyl methacrylate.
- 4. A coating composition comprising a solution of a polymer of claim 1 in an organic solvent.
- 5. The polymer of claim 1 containing 15-50% of copolymerized isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate.
- 6. The polymer of claim 1 wherein X is COO'A--NCO.
- 7. The polymer of claim 1 wherein 25-40% by number of the polymer molecules contain a terminal RS-- group.
- 8. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/methyl methacrylate/butyl methacrylate/mercaptan.
- 9. The polymer of claim 8 wherein the monomeric weight ratio is 45.9/22.9/19.4/11.8.
- 10. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/styrene/mercaptan.
- 11. The polymer of claim 10 wherein the monomeric weight ratio is 45.9/42.6/10.7.
- 12. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/butyl acrylate/mercaptan.
- 13. The polymer of claim 12 wherein the monomeric weight ratio is 45.5/41.6/12.8.
- 14. The polymer of claim 12 wherein the monomeric weight ratio is 45.7/45.4/6.7.
- 15. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/ethylhexyl acrylate/mercaptan.
- 16. The polymer of claim 15 wherein the monomeric weight ratio is 45.2/41.9/12.8.
- 17. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/methyl methacrylate/n-butyl acrylate/mercaptan.
- 18. The polymer of claim 17 wherein the monomeric weight ratio is 28.1/57.6/9.7/2.1.
- 19. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/methyl methacrylate lauryl methacrylate/mercaptan.
- 20. The polymer of claim 19 wherein the monomeric weight ratio is 30/60/10/2.1.
- 21. A polymer of claim 1 of the monomers isocyanatoethyl methacrylate/butyl acrylate/styrene/mercaptan.
- 22. The polymer of claim 19 wherein the monomeric weight ratio is 53.27/19.6/19.1/7.04.
- 23. A substantially anhydrous solution of at least 60% by weight of a polymer of claim 1 in an organic solvent.
- 24. A substantially anhydrous solution of at least 60% by weight of a polymer of claim 8, 10, 12, 15 or 17 in an organic solvent.
- 25. A moisture-curing coating composition of a polymer of claim 1.
- 26. A coating composition of claim 25 containing a curing catalyst.
- 27. A coating composition of claim 25 containing a pigment.
- 28. A coating composition of claim 25 wherein X is COOR.sub.2.
- 29. A coating composition of claim 25 wherein R.sub.2 is an alkyl group having 1-12 carbons.
- 30. A coating composition of claim 25 wherein X is phenyl.
- 31. A moisture-curing coating composition of a polymer of claim 8, 10, 12, 15, 17, 19 or 21.
- 32. A coating composition comprising a solution of a polymer of claim 8, 10, 12, 15, 17, 19 or 21 in an anhydrous solvent.
RELATED APPLICATIONS
This application is a continuation-in-part of our copending application, Ser. No. 053,301, filed June 29, 1979, and now abandoned, which is a division of our then copending application, Ser. No. 819,121, filed July 26, 1977, and now abandoned. Both of these applications are specifically incorporated by reference herein.
US Referenced Citations (5)
Foreign Referenced Citations (5)
Number |
Date |
Country |
759860 |
Oct 1956 |
GBX |
774897 |
May 1957 |
GBX |
1202777 |
Aug 1970 |
GBX |
1207532 |
Oct 1970 |
GBX |
1235364 |
Jun 1971 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
819121 |
Jul 1977 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
53301 |
Jun 1979 |
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