Remoistening adhesive composition and adhesive sheet

Claim 2

In a remoistening adhesive composition based on high amylopectin, low amylose starch, the improved combination with poly(vinyl methyl ether-maleic acid monoalkyl ester), in a minor amount effective to increase the initial tack and decrease the bonding time of the composition.

Claim 3

A composition as defined in claim 1 and wherein said polymer is present in a proportion of about 1.5- 20% by weight of the composition, on a solids basis.

Claim 4

A composition as defined in claim 2 and wherein said alkyl radical has 1-4 carbon atoms.

Claim 5

A composition as defined in claim 2 wherein said alkyl radical is methyl, ethyl, isopropyl, or n-butyl, and the specific viscosity of said polymer as determined on a solution of 1 gram thereof in 100 ml. of methanol at 25° C is approximately as follows: ______________________________________ Alkyl Radical Specific Viscosity ______________________________________ Methyl 0.9-1.3 Ethyl 1.1-1.5 Isopropyl 1.3-1.7 n-Butyl 1.6-2.0. ______________________________________

Claim 6

A composition as defined in claim 1 and wherein said starch is present in a minimum proportion of about 60% by weight of the composition, on a solids basis.

Claim 7

A composition as defined in claim 5 and wherein said starch contains up to about 10% amylose by weight and the balance substantially amylopectin.

Claim 8

A composition as defined in claim 6 and wherein the amylose content of the composition is below about 30% by weight, on a solids basis.

Claim 9

A remoistening adhesive composition which comprises, in approximate percentages by weight: ______________________________________ Dextrin up to 20 % Anticurling agent up to 15 % Wetting agent up to 5 % Poly(vinyl methyl ether-maleic acid monoalkyl ester) 1.5 to 20 % Starch Balance ______________________________________ said dextrin being white corn dextrin or canary dextrin containing up to about 35% amylose by weight, said alkyl radical having 1-4 carbon atoms, and said starch containing up to about 10% amylose by weight and the balance substantially amylopectin, the minimum proportion of said starch being about 60% by weight.

Claim 10

A remoistening adhesive composition which comprises, in approximate percentages by weight: ______________________________________ Dextrin up to 20 % Anticurling agent up to 15 % Wetting agent up to 5 % Poly(vinyl methyl ether-maleic acid monoalkyl ester) 1.5 to 20 % Starch Balance ______________________________________ said dextrin being white corn dextrin or canary dextrin containing up to about 35% amylose by weight, said alkyl radical having 1-4 carbon atoms, and said starch containing up to about 10% amylose by weight and the balance substantially amylopectin, the minimum proportion of said starch being about 60% by weight.

Claim 11

A composition as defined in claim 8 and wherein said alkyl radical is methyl, ethyl, isopropyl, or n-butyl, and the specific viscosity of said polymer as determined on a solution of 1 gram thereof in 100 ml. of methanol at 25° C is approximately as follows: ______________________________________ Alkyl Radical Specific Viscosity ______________________________________ Methyl 0.9-1.3 Ethyl 1.1-1.5 Isopropyl 1.3-1.7 n-Butyl 1.6-2.0. ______________________________________

Claim 12

A composition as defined in claim 9 and containing about 5-20% dextrin, about 5-15% anticurling agent, and about 0.5-5% wetting agent, in percentages by weight.

Claim 13

A remoistening adhesive composition which comprises, in approximate percentges by weight: ______________________________________ White corn dextrin 8.5 % Polyacrylamide 2.5-2.6 % Calcium chloride 1.3-1.5 % Poly(vinyl methyl ether- maleic acid n-butyl ester) 2.5-2.6 % Starch 85.0 % ______________________________________ said dextrin containing about 25-35% amylose by weight, said starch containing up to about 10% amylose and the balance substantially amylopectin, and said poly (vinyl methyl ether-maleic acid n-butyl ester) having a specific viscosity of about 1.6-2.0 as determined on a solution of 1 gram thereof in 100 ml. of methanol at 25° C.

Claim 14

A remoistening adhesive composition which comprises, in approximate percentges by weight: ______________________________________ White corn dextrin 8.5 % Polyacrylamide 2.5-2.6 % Calcium chloride 1.3-1.5 % Poly(vinyl methyl ether- maleic acid n-butyl ester) 2.5-2.6 % Starch 85.0 % ______________________________________ said dextrin containing about 25-35% amylose by weight, said starch containing up to about 10% amylose and the balance substantially amylopectin, and said poly (vinyl methyl ether-maleic acid n-butyl ester) having a specific viscosity of about 1.6-2.0 as determined on a solution of 1 gram thereof in 100 ml. of methanol at 25° C.

Claim 15

An adhesive sheet which comprises a sheet of paper coated on one side thereof with a composition as defined in claim 1.

Claim 16

An adhesive tape which comprises a flexible elongated paper strip coated on one side thereof with a composition as defined in claim 1.