Polymeric vehicle for coating
AssigneeNorth Dakota State University
InventorsFrank N. Jones, Der-Shyang Chen, Adel F. Dimian, Daozhang Wang
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Abstract
This invention relates to a polymeric vehicle comprising a modified polymer containing covalently bonded mesogenic groups. The modified polymer may be used as the sole component of the polymeric vehicle for a coating to which may be added solvents and known additives to provide a formulated coating. The polymeric vehicle may further include other modified or unmodified polymers and cross-linking resins. The polymeric vehicle provides a coating binder and coating film of high hardness, flexibility and impact resistance.
Claims157
A polymeric vehicle which when applied to a substrate provides a coating binder having a Tg not greater than about 60.degree. C., a pencil hardness of at least about H, and a reverse impact resistance of at least about 30 inch-lbs. at a binder thickness of about 1 mil, said polymeric vehicle comprising:
- (a) from about 100 to about 35 weight percent, based upon the weight of the polymeric vehicle, of a modified polymer, said modified polymer being a polyester polymer covalently bound to at least one mesogenic group selected from the group consisting of radicals of the Formula I, II, III, IV and V:
- ##STR93## u=X m=an integer from 2 to 8;
- n=1 or 2;
- p=an integer from 1 to 4;
- q=an integer from 1 to 3 and
- (b) from about 0 to about 65 weight percent based upon the weight of the polymeric vehicle, of a composition selected from the group consisting of cross-linker resin, unmodified polymer resin, and mixtures thereof and wherein the modified polymer is modified to contain about 5 to about 50 weight percent mesogenic groups.
A polymeric vehicle for providing a coating binder have a Tg not greater than about 60.degree. C., a pencil hardness of at least about H, and a reverse impact resistance of at least about 30 inch-lbs. when the coating binder has a thickness of about 1 mil, said polymeric vehicle comprising:
- (a) from about 100 to about 35 weight percent, based upon the weight of the polymeric vehicle, of a modified polymer, said modified polymer being a reaction product of p-hydroxybenzoic acid and a linear oligoester diol, said linear oligoester diol a reaction product of a heated mixture of phthalic acid, isophthalic acid, terephthalic acid, hexahydrophthalic anhydride, an aliphatic dicarboxylic acid having a carbon chain length of from 4 to 36 and aliphatic primary or secondary diol, having from 2 to 23 carbons;
- and
- (b) from about 0 to about 65 weight percent based upon the weight of the polymeric vehicle of a cross-linker resin selected from the group consisting of polyisocyanate, a melamine and mixtures thereof.
A coating binder having a Tg not greater than about 60.degree. C., a pencil hardness of at least about H, and a reverse impact resistance of at least about 30 inch-lbs. at a binder thickness of 1 mil, which is provided by application to a substrate of a polymeric vehicle in the presence of a solvent therefor, said polymeric vehicle comprising:
- (a) from about 100 to about 35 weight percent of at least one modified polymer, said modified polymer being formed by reaction of a polyester polymer with at least one mesogenic group selected from the group consisting of radicals of Formulas I, II, III, IV and V:
- ##STR180## u=X m=an integer from 2 to 8;
- n=1 or 2;
- p=an integer from 1 to 4;
- q=an integer from 1 to 3 and
- (b) from about 0 to about 65 weight percent of a composition selected from the group consisting of a cross-linker resin, unmodified polymer resin, and mixtures thereof and wherein the binder contains from about 5 to about 50 weight percent mesogenic groups.
A process for preparing a coating binder having a Tg not greater than about 60.degree. C., a pencil hardness of at least about H, and a reverse impact resistance of at least about 30 inch-lbs. at a binder thickness of about 1 mil, which process comprises:
- mixing a modified polymer with a composition selected from the group consisting of cross-linker resin, unmodified polymer resin, and mixtures thereof to provide a polymeric vehicle, the polymeric vehicle comprising at least about 100 to about 35 weight percent, based upon the weight of the polymeric vehicle, of the modified polymer, said modified polymer being a polyester polymer covalently bound to at least one mesogenic group selected from the group consisting of radicals of the Formula I, II, III, IV and V:
- ##STR181## u=X m=an integer from 2 to 8;
- n=1 or 2;
- p=an integer from 1 to 4;
- q=an integer from 1 to 3;
- the polymeric vehicle comprising not more than about 65 weight percent based upon the weight of the polymeric vehicle, of the composition and the modified polymer having from about 5 to about 50 weight percent mesogenic groups.
A process for preparing a formulated coating composition which when applied to a substrate provides a coating binder having a Tg not greater than about 60.degree. C., a pencil hardness of at least about H, and a reverse impact resistance of at least about 30 inch-lbs. at a binder thickness of about 1 mil, the process comprising:
- mixing a modified polymer with a composition selected from the group consisting of cross-linker resin, unmodified polymer resin, and mixtures thereof, to provide a polymeric vehicle, the polymeric vehicle comprising at least about 35 weight percent, based upon the weight of the polymeric vehicle, of the modified polymer, said modified polymer being selected from the group consisting of a polyester polymer covalently bound to at least one mesogenic group selected from the group consisting of radicals of the Formula I, II, III, IV and V:
- ##STR182## u=X m=an integer from 2 to 8;
- n=1 or 2;
- p=an integer from 1 to 4;
- q=an integer from 1 to 3;
- the polymeric vehicle comprising not more than about 65 weight percent based upon the weight of the polymeric vehicle, of the composition and the modified polymer having from about 5 to about 50 weight percent mesogenic groups.
Dependencies are inferred from the claim text.