Coating compositions comprising isocyanate-functional polymers containing a terminal thioalkyl group

Claim 2

A coating composition consisting essentially of (A) a polymeric or a low molecular weight polyfunctional material containing a functional group complementary to an isocyanate functionality selected from the group consisting of hydroxyl, amino, and carboxyl; and (B) a crosslinking agent which is an isocyanate-functional polymer containing at least 10%, by weight of the polymer, of copolymerized isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate, wherein at least 10% by number of the polymer molecules have the following structure: ##STR10## where R is alkyl or aryl; R 1 is hydrogen or methyl; X is a COO--A--NCO or a mixture of COO--A--NCO and at least one of phenyl, COOR 2 , ##STR11## Cl, H; where A is an alkylene group having 2-6 carbon atoms, and R 2 is an alkyl group having 1-18 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.

Claim 3

A coating composition of claim 1 consisting essentially of (A) a polymer containing functional group complementary to an isocyanate functionality selected from the group consisting of hydroxyl, amino, and carboxyl; and (B) a crosslinking agent which is an isocyanate-functional polymer containing at least 10%, by weight of the polymer, of copolymerized isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate, wherein at least 10% by number of the polymer molecules have the following structure: ##STR12## where R is alkyl or aryl, R 1 is hydrogen or methyl; X is COO--A--NCO or a mixture of COO--A--NCO and at least one of phenyl, COOR 2 , ##STR13## Cl, H; where A is an alkylene group having 2-6 carbon atoms, and R 2 is an alkyl group having 1-18 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.

Claim 4

A coating composition of claim 1 consisting essentially of (A) a polymer which is the copolymer of styrene, methyl methacrylate, and the esterification product of hydroxyethyl acrylate, phthalic anhydride, and a glycidyl ester of the formula ##STR14## where R 4 is a tertiary aliphatic hydrocarbon group containing 8-10 carbon atoms; in the weight ratio of approximately 30:15:55; and (B) an isocyanate-functional polymer containing at least 10%, by weight of the polymer, of copolymerized isocyanatoethyl methacrylate wherein at least 10% by number of the polymer molecules have the following structure: ##STR15## where R is alkyl; R 1 is hydrogen, methyl or mixtures thereof; X is a mixture of COO--CH 2 CH 2 --NCO and at least one of phenyl, COOR 2 , ##STR16## Cl, and H, where R 2 is an alkyl group having 1-18 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.

Claim 5

A coating composition of claim 1 consisting essentially of (A) a polyol and (B) a polymer of butyl acrylate, isocyanatoethyl methacrylate and lauryl mercaptan.

Claim 6

A coating composition of claim 1 consisting essentially of (A) 2-ethyl-1,3-hexanediol and (B) a polymer of butyl acrylate, isocyanatoethyl methacrylate and lauryl mercaptan.

Claim 7

A self-supporting film formed from a coating composition of claim 5.

Claim 8

A coating composition of claim 1 consisting essentially of (A) a diamine and (B) a polymer of butyl acrylate, isocyanatoethyl methacrylate and lauryl mercaptan.

Claim 9

A self-supporting film formed from a coating composition of claim 7.

Claim 10

A coating composition of claim 1 which is air-curable and wherein (A) is a drying oil alcohol.

Claim 11

A coating composition of claim 1 wherein (A) is a low molecular weight polyfunctional material selected from the group consisting of ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, butylene glycols, 1,12-dodecanediol, 2,2,4-trimethylpentane-1,3-diol, 2-ethyl-1,3-hexanediol, trimethylol propane, and pentaerythritol.

Claim 12

A coating composition of claim 1 wherein (A) is a low molecular weight polyfunctional material selected from the group consisting of 2,2,6,6-tetramethylpiperazine and bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate.

Claim 13

A graft polymer obtained by contacting (A) An isocyanate-functional polymer containing at least 10%, by weight of the polymer, of copolymerized isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate, wherein at least 10% by number of the polymer molecules have the following structure: ##STR17## where R is alkyl or aryl, R 1 is hydrogen or methyl; X is COO--A--NCO or a mixture of COO--A--NCO and at least one of phenyl, COOR 2 , ##STR18## Cl, H; where A is an alkylene group having 2-6 carbon atoms, and R 2 is an alkyl group having 1-18 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; and (B) a substantially mono-functional polymer whose functional group is selected from the group consisting of OH, COOH, NH 2 , and NHR 3 , where R 3 is an alkyl group having 1-4 carbon atoms.

Claim 14

A graft polymer obtained by contacting (A) An isocyanate-functional polymer containing at least 10%, by weight of the polymer, of copolymerized isocyanatoalkyl acrylate or isocyanatoalkyl methacrylate, wherein at least 10% by number of the polymer molecules have the following structure: ##STR17## where R is alkyl or aryl, R 1 is hydrogen or methyl; X is COO--A--NCO or a mixture of COO--A--NCO and at least one of phenyl, COOR 2 , ##STR18## Cl, H; where A is an alkylene group having 2-6 carbon atoms, and R 2 is an alkyl group having 1-18 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; and (B) a substantially mono-functional polymer whose functional group is selected from the group consisting of OH, COOH, NH 2 , and NHR 3 , where R 3 is an alkyl group having 1-4 carbon atoms.