Polyurethane/polyureas

Patent metadata

Field	Value
Publication number	US-9994666-B2
Application number	US-201314108911-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Dec 17, 2013
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

This invention relates to polyurethane/polyureas. These polyurethane/polyurea materials comprise the reaction product of (A) a polyisocyanate prepolymer having an NCO group content of about 4 to about 30% and an average functionality of 1.8 to 6, and (B) an isocyanate-reactive component comprising at least one aromatic diamine compound. The (A) polyisocyanate prepolymers herein comprise the reaction product of (1) at least one (cyclo)aliphatic polyisocyanate with (2) an organic compound having 1.8 to 5 hydroxyl groups and a hydroxyl equivalent weight of 150 to 2000 g/eq., and which is selected from the group consisting of OH-functional polybutadienes, OH-functional polyalkylene, OH-functional polyalkylene phthalates, OH-functional polyalkylene isophthalates, OH-functional polyalkylene terephthalates and mixtures thereof.

First claim

What is claimed is:

1. A polyurethane/polyurea material comprising the reaction product of:
(A) a polyisocyanate prepolymer having an NCO group content of about 4 to 30%, and an average functionality of 1.8 to 6 which consists of the reaction product of
(1) dicyclohexylmethane-4,4′-diisocyanate having an NCO group content of about 15% to 60% by weight, and a functionality of about 1.8 to 5;
with
(2) an organic compound consisting of an OH-functional polybutadiene having from 1.8 to 5 hydroxyl groups and an hydroxyl equivalent weight of from 150 to 500 g/eq.;

with
(B) an isocyanate-reactive component consisting of 3,5-dimethylthiotoluene-2,4-diamine, 3,5-dimethylthiotoluene-2,6-diamine, 3,5-diethyltoluene-2,4-diamine, 3,5-diethyltoluene-2,6-diamine, or mixtures thereof, in the absence of other isocyanate-reactive components;

wherein the relative quantities of (A) and (B) are such that the Isocyanate Index is from about 70 to about 130, and the resultant polyurethane/urea is optically clear.

2. A process for preparing a polyurethane/polyurea material comprising reacting:
(A) a polyisocyanate prepolymer having an NCO group content of about 4 to 30%, and an average functionality of 1.8 to 6 which consists of the reaction product of
(1) dicyclohexylmethane-4,4-diisocyanate having an NCO group content of about 15 to 60% by weight, and a functionality of about 1.8 to 5;
with
(2) an organic compound consisting of an OH-functional polybutadiene having from 1.8 to 5 hydroxyl groups, and a hydroxyl equivalent weight of from 150 to 500 g/eg;

with
(B) an isocyanate-reactive component consisting of 3,5-dimethylthiotoluene-2,4-diamine, 3,5-dimethylthiotoluene-2,6-diamine, 3,5-diethyltoluene-2,4-diamine, 3,5-diethyltoluene-2,6-diamine, or mixtures thereof, in the absence of other isocyanate-reactive components;

wherein the relative quantities of (A) and (B) are such that the Isocyanate Index is from about 70 to about 130, and the resultant polyurethane/urea is optically clear.

3. The polyurethane/polyurea material of claim 1 , wherein the relative quantities of (A) and (B) are such that the Isocyanate Index is from about 90 to about 110.

4. The process of claim 2 , wherein the relative quantities of (A) and (B) are such that the Isocyanate Index is from about 90 to about 110.

Assignees

• Bayer Materialscience Llc
• Covestro Llc

Inventors

• Haider Karl W
• Gustavich Wendy
• Roesler Richard R
• Starcher Rick V

Classifications

• C08G18/69 Primary

  Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)} · CPC title

• C08G18/324

  containing only one aromatic ring · CPC title

• C08G18/10 Primary

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G18/4211

  derived from aromatic dicarboxylic acids and dialcohols · CPC title

• C08L75/02

  Polyureas · CPC title