Preparation process of polyurethane prepolymer, preparation proc

Details Preparation process of polyurethane prepolymer, preparation proc Preparation process of polyurethane prepolymer, preparation proc

1996-12-20

1999-01-26

Niland, Patrick D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524590, 524839, 524840, 528 44, 528 60, 528 73, 528 75, 528 80, 528 81, 528 85, C08J 300, C08K 320, C08L 7500, C08G 1800

Patent

active

058639802

ABSTRACT:
A process for preparing a polyurethane prepolymer containing carboxylic group(s), or both carboxylic group(s) and double bond(s), which comprises the steps of 1) preparing a diol or triol monomer having carboxylic group(s), or having both carboxylic group(s) and double bond(s) by performing an addition reaction of at least one acid anhydride(s) which may contain double bond(s), with at least one triol or tetraol derivative(s) containing three or four hydroxyl groups in a molar ratio from 0.5:1 to 2:1; and then 2) reacting the obtained diol or triol monomer, or their mixture with a polyol and a diisocyanate or a diisocyanate polymer to give polyurethane prepolymer having an NCO content of 0.1 to 30%, is disclosed. In addition, a process for preparing a water-stable aqueous polyurethane dispersion by neutralizing, dispersing, and chain extending the polyurethane prepolymer obtained above is provided. As the polyurethane dispersion according has excellent luster, elasticity, and water-repellency, it is very useful as a coating agent, an adhesive, or a paper sizing agent.

REFERENCES:
patent: 3923713 (1975-12-01), Hermann
patent: 4172191 (1979-10-01), Nachtkamp et al.
patent: 4238378 (1980-12-01), Markusch et al.
patent: 4250077 (1981-02-01), von Bonin et al.
patent: 4460738 (1984-07-01), Frentzel et al.

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