Paper having a melt-stable lactide polymer coating and process for manufacture thereof
AssigneeCargill, Incorporated
InventorsPatrick Richard Gruber, Jeffrey John Kolstad, Christopher M. Ryan, Eric Stanley Hall, Robin Sue Eichen Conn
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Abstract
A lactide polymer coating resulting in a strong, repulpable, high gloss, paper coating. The lactide polymer comprises a plurality of poly(lactide) polymer chains, residual lactide in concentration of less than about 5 percent and water in concentration of less than about 2000 parts-per-million. A process for coating paper with the lactide polymer composition is also disclosed.
Claims22
A lactide polymer composition comprising:
- (a) polymer resulting from co-polymerizing a polymerizable mixture comprising L-lactide and at least one other polymerizable material;
- the polymerizable mixture comprising at least 90%, by wt., L-lactide;
- (b) the polymer having a number average molecular weight of at least 40,000 and no greater than about 150,000, and a ratio of weight average molecular weight to number average molecular weight of at least 1.9;
- (c) the polymer further resulting from co-polymerizing a polymerizable mixture including a catalyst and wherein the catalyst is added at a catalyst-to-monomer ratio of 1:10,000 or less, on a molar basis;
- (i) the catalyst comprising a ring opening polymerization catalyst;
- (d) the lactide polymer composition further comprising no more than 1% by wt. residual lactide monomer, if any residual lactide monomer is present;
- and,
- (e) the lactide polymer composition including an antioxidant.
A coating composition comprising a lactide polymer composition, said lactide polymer composition comprising:
- (a) polymer resulting from co-polymerizing a polymerizable mixture comprising L-lactide and at least one other polymerizable material;
- the polymerizable mixture comprising at least 90%, by wt., L-lactide;
- (b) the polymer having a number average molecular weight of molecular weight of at least 40,000, and no greater than about 150,000, and a ratio of weight average molecular weight to number average molecular weight of at least 1.9;
- (c) the polymer further resulting from co-polymerizing a polymerizable mixture including a catalyst and wherein the catalyst is added at a catalyst-to-monomer ratio of 1:10,000 or less, on a molar basis;
- (i) the catalyst comprising a ring opening polymerization catalyst;
- (d) the lactide polymer composition further comprising no more than 1% by wt. residual lactide monomer, if any residual lactide monomer is present;
- and,
- (e) the lactide polymer composition including an antioxidant.
A coated paper product comprising paper and a coating, said coating comprising:
- (a) a plurality of polymer chains resulting from co-polymerizing a polymerizable mixture comprising L-lactide and at least one other polymerizable material;
- the polymerizable mixture comprising at least about 50%, by wt., L-lactide;
- (b) the polymer having a number average molecular weight of molecular weight of at least 40,000, and no greater than about 150,000, and a ratio of weight average molecular weight to number average molecular weight of at least 2.1;
- (c) the polymer further resulting from co-polymerizing a polymerizable mixture including a catalyst comprising a ring opening polymerization catalyst;
- (d) the lactide polymer composition including a catalyst deactivating agent in an amount sufficient to reduce catalytic depolymerization, relative to an absence of the catalyst deactivating agent;
- (e) the lactide polymer composition further comprising no more than 1% by wt. residual lactide monomer, if any residual lactide monomer is present;
- and,
- (f) the lactide polymer composition including an antioxidant.
Dependencies are inferred from the claim text.