Cements

Claim 2

A poly(carboxylate) cement pack comprising as one component a water-soluble copolymer of acrylic acid and an unsaturated aliphatic carboxylic acid selected from the group consisting of methacrylic acid, aconitic acid, maleic acid, tiglic acid, fumaric acid and mesaconic acid, the mole ratio of acrylic acid to unsaturated aliphatic carboxylic acid in said copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000 and as another component a fluoroaluminosilicate glass cement powder which will react with the acrylic acid copolymer in the presence of water to give a plastic mass which hardens to form a poly(carboxylate) cement.

Claim 3

A cement pack according to claim 1, in which the acrylic acid copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid copolymer.

Claim 4

A cement pack according to claim 1, that comprises from 15% to 85% by weight of the cement powder, from 3% to 50% by weight of the acrylic acid copolymer and from 5% to 70% by weight of water.

Claim 5

A cement pack according to claim 2, in which the weight ratio of cement powder to liquid is from 0.5:1 to 5:1.

Claim 6

A cement pack according to claim 2, in which the solution has a viscosity as hereinbefore defined of from 5 to 40 poise.

Claim 7

A cement pack according to claim 1, that comprises a water soluble chelating agent.

Claim 8

A cement pack according to claim 1, in which the degree of fineness of the cement powder is such that it will pass through a 150 mesh B.S. sieve.

Claim 9

A process for the preparation of a poly(carboxylate) cement which comprises mixing a water-soluble copolymer of acrylic acid and an unsaturated aliphatic carboxylic acid selected from the group consisting of methacrylic acid, aconitic acid, maleic acid, tiglic acid, fumaric acid and mesaconic acid, the mole ratio of acrylic acid to unsaturated aliphatic carboxylic acid in said copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000 with a fluoroaluminosilicate glass cement powder which will react with the acrylic acid copolymer in the presence of water to give a mass that remains plastic long enough to be formed into a desired shape prior to hardening as a poly(carboxylate) cement.

Claim 10

A process for the preparation of a poly(carboxylate) cement which comprises mixing a water-soluble copolymer of acrylic acid and an unsaturated aliphatic carboxylic acid selected from the group consisting of methacrylic acid, aconitic acid, maleic acid, tiglic acid, fumaric acid and mesaconic acid, the mole ratio of acrylic acid to unsaturated aliphatic carboxylic acid in said copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000 with a fluoroaluminosilicate glass cement powder which will react with the acrylic acid copolymer in the presence of water to give a mass that remains plastic long enough to be formed into a desired shape prior to hardening as a poly(carboxylate) cement.

Claim 11

A process according to claim 8, in which the acrylic acid copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid copolymer.

Claim 12

A process according to claim 9, in which the solution has a viscosity as hereinbefore defined of from 5 to 40 poise.

Claim 13

A process according to claim 8, that is carried out in the presence of a water soluble chelating agent.

Claim 14

A process according to claim 8, in which the cement powder has a degree of fineness such that it will pass through a 150 mesh B.S. sieve.

Claim 15

A process according to claim 9, in which the powder and liquid components are mixed in a powder to liquid ratio of from 1:1 to 4:1.

Claim 16

A poly(carboxylate) cement consisting essentially of the reaction product of the reaction between a copolymer of acrylic acid and an unsaturated aliphatic carboxylic acid selected from the group consisting of methacrylic acid, aconitic acid, maleic acid, tiglic acid, fumaric acid and mesaconic acid, the mole ratio of acrylic acid to unsaturated aliphatic carboxylic acid in said copolymer being from 19:1 to 2:1, said copolymer having an average molecular weight of from 5,000 to 19,000 and a fluoroaluminosilicate glass cement powder in the presence of water.

Claim 17

A poly(carboxylate) cement consisting essentially of the reaction product of the reaction between a copolymer of acrylic acid and an unsaturated aliphatic carboxylic acid selected from the group consisting of methacrylic acid, aconitic acid, maleic acid, tiglic acid, fumaric acid and mesaconic acid, the mole ratio of acrylic acid to unsaturated aliphatic carboxylic acid in said copolymer being from 19:1 to 2:1, said copolymer having an average molecular weight of from 5,000 to 19,000 and a fluoroaluminosilicate glass cement powder in the presence of water.

Claim 18

The poly(carboxylate) cement according to claim 14, in which the copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid copolymer.

Claim 19

The poly(carboxylate) cement according to claim 14, in which the weight ratio of cement powder to liquid is from 0.5:1 to 5:1.

Claim 20

The poly(carboxylate) cement according to claim 14, in which the copolymer has a viscosity as herein-before defined of from 5 to 40 poise.

Claim 21

The poly(carboxylate) cement according to claim 14, in which said reaction is carried out in the presence of a chelating agent.

Claim 22

The poly(carboxylate) cement according to claim 14, in which the cement powder has a degree of fineness such that it will pass through a 150 mesh B.S. sieve.

Claim 23

The poly(carboxylate) cement according to claim 14, in which the powder and liquid components are mixed in a powder to liquid ratio of from 1:1 to 4:1.