Adhesive aqueous dispersions of polyvinyl alcohol graft polymers with acidic hardeners and process of production

US4118357A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Hartmut Brabetz · Burghausen, DE
• Christof Kemenater · Burghausen, DE
• Franz Six · Burghausen, DE
• Wilhelm Kaiser · Burghausen, DE

Key dates

• Filing date: May 2, 1977
• Grant date: Oct 3, 1978
• Expiry date: May 2, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F261/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An aqueous copolymer adhesive dispersion having a long pot life and giving highly waterproof bonds, comprising an acid hardener of water-soluble acids having pKs of under 0 and an aqueous dispersion of a pre-crosslinked polyvinyl ester grafted onto polyvinyl alcohol, said polyvinyl ester being an ester of an acid of 1 to 12 carbon atoms and said pre-crosslinking caused by the presence of small amounts of poly-ethylenically-unsaturated compounds in the monomer mixture, as well as the aqueous dispersion and the method for its production.