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US 2016/0355632 A1Published application
Aqueous dispersions of cationic film-forming polyurethanes
AssigneeLamberti SPA
InventorsVito ALANZO, Gabriele COSTA, Dario CONTI, Giuseppe LI BASSI
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Abstract
Stable aqueous dispersions of film-forming cationic polyurethanes are prepared by extending with water a cationic prepolymer obtained from aliphatic diisocyanates, aliphatic tertiary amines having two hydroxyl groups that react with —NCO groups, linear polyols and methanesulfonic acid.
Claims24
A method for preparing an aqueous dispersion of film-forming cationic polyurethanes comprising:
- A) reacting one or more aliphatic diisocyanates with an aliphatic tertiary amine having two hydroxyl groups that react with an —NCO group and a linear hydroxyl terminated polyether or polyester dioll having a molecular weight of from about 500 to about 5,000, to obtain a prepolymer having free isocyanate groups;
- B) salifying amine groups of the prepolymer with methanesulfonic acid;
- and
- C) extending the obtained cationic prepolymer with water, and,
- wherein in step A), the molar ratio between aliphatic diisocyanates and compounds having two reactive hydroxyl groups (linear polyol and aliphatic tertiary amine) is from about 1.2 to about 2.2.
2 more elements
A composition comprising an aqueous dispersion of film forming cationic polyurethanes prepared by a method comprising:
- A) reacting one or more aliphatic diisocyanates with an aliphatic tertiary amine having two hydroxyl groups that react with an —NCO group and a linear hydroxyl terminated diol polyol of the polyether or polyol polyester type having a molecular weight of from 500 to 5,000, to obtain a prepolymer having free isocyanate groups;
- B) salifying amine groups of the prepolymer with methanesulfonic acid;
- and
- C) extending the obtained cationic prepolymer with water, and,
- wherein in step A), the molar ratio between aliphatic diisocyanates and compounds having two reactive hydroxyl groups (linear polyol and aliphatic tertiary amine) is from about 1.2 to about 2.2.
2 more elements
Dependencies are inferred from the claim text.