Melamine-aldehyde resin and postformable laminate made therefrom
AssigneeWestinghouse Electric Corp.
InventorsHarold O. McCaskey, Jr., Lenon G. Brooker
Life of this patent
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Abstract
A melamine-aldehyde resin is disclosed of a composition of melamine-aldehyde, a water-soluble, aliphatic diglycidyl ether, and water. The composition is cured to the A-stage and an absorbent sheet is impregnated with the resin which is then cured to the B-stage. At least one B-staged sheet is stacked with a postformable core stock and heated and pressed to form a C-staged postformable laminate. The laminate can be heated and pressed to postform it. The postformed laminate can be adhesively bonded to a substrate to form a counter top or other article.
Claims68
A composition comprising
- 1. an aldehyde and melamine in a mole ratio of about 1.5 to about 6;
- 2. about 1 to about 50% (by weight based on melamine weight) of a water-soluble, aliphatic diglycidyl ether;
- and
- 3. sufficient water to form a solution of about 15 to about 65% solids.
An article comprising an absorbent sheet impregnated with an A-staged composition which comprises:
- 1. an aldehyde and melamine in a mole ratio of about 1.5 to about 6;
- 2. about 1 to about 50% by weight based on melamine weight of a water-soluble, aliphatic diglycidyl ether;
- and
- 3. sufficient water to form a solution of about 15 to about 65% solids.
A laminate comprising a postformable core stock to which is bonded at least one absorbent sheet impregnated with a C-staged composition comprising:
- A. an aldehyde and melamine in a mole ratio of about 1.5 to about 6;
- B. about 1 to about 50% by weight based on melamine weight of a water-soluble, aliphatic diglycidyl ether;
- and
- c. sufficient water to form a solution of about 15 to about 65% solids.
A method of making a postformable laminate comprising:
- A. preparing an A-staged composition which comprises
- 1. an aldehyde and melamine in a mole ratio of about 1.5 to about 6;
- 2. about 1 to about 50% by weight based on melamine weight of water-soluble, aliphatic diglycidyl ether;
- and
- 3. sufficient water to form a solution of about 15 to about 65% solids.
- B. applying said composition to an absorbent sheet to a weight ratio of composition solids to absorbent sheet of about 1.2 to about 4.0;
- C. reacting said composition to the B-stage;
- D. forming a stack of at least one of said sheets with a postformable core stock;
- and
- E. curing said stack to the C-stage.
Dependencies are inferred from the claim text.