Adhesives
OwnerZhikai Wang, Xinya Lu +2inventors
InventorsZhikai Wang, Xinya Lu, Morris Johnson, JoAnn Arceneaux
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Abstract
UV curable urethane (meth)acrylate polymers which useful as laminating and pressure sensitive adhesives am disclosed and methods of making them. The polymers comprise a urethane extended backbone formed by reacting diisocyanates with a mixture of polyols derived from acrylates and polyols derived from rubber polymers.
Claims10
A polymer of Formula 1:
- where:
- R1 and R′1 are each independently hydrogen or C1-4alkyl, conveniently H or methyl,
- R2, R′2 and R3 are each independently optionally substituted organo group, conveniently optionally substituted hydrocarbo, more conveniently optionally substituted C1-36hydrocarbylene;
- for example C1-8alkylene;
- R4 is a divalent random block copolymeric moiety (=‘backbone’) of Formula 2:
- where:
- A′ is an organo residue obtained and/or obtainable from one or more polyols comprising at least one activated unsaturated moiet(ies), where the polyol(s) are monodisperse compounds of low molecular weight and preferably hydrophilic;
- B′ is an organo residue obtained and/or obtainable from one or more polyols comprising at least one activated unsaturated moiet(ies);
- where the polyol(s) are polymers of high molecular weight and preferably hydrophobic;
- m and n are independent integers;
- and
- p is from about 2 to about 100.
A polymer of Formula 1A:
- where:
- R1 is hydrogen or methyl;
- R2 is a divalent residue derived from alkyl or alkoxy hydroxy (meth) acrylate(s);
- more preferably an alkyl or alkoxy residue;
- R3 is a divalent residue derived from aliphatic, cycloaliphatic, heterocyclic and/or aromatic diisocyanate(s);
- R4 is a divalent random block copolymer backbone of Formula 2A:
- where:
- A is a divalent residue derived from one or more acrylic-derived polyol(s);
- B is a divalent residue derived from one or more rubber-derived polyol(s);
- m and n are independently an integer from 1 to 20;
- and
- p is from about 2 to about 50.
A polymer as claimed in either preceding claim having a z-average molecular weight (Mz) measured by gel permeation chromatography (GPC) from about 50 to about 5,500 kilo Daltons (kDa).
A method of preparing a UV curable urethane (meth)acrylate polymer by reacting a hydroxyl functional ethylenically unsaturated polymer precursor with one or more di-isocyanates, where the hydroxyl functional ethylenically unsaturated polymer precursor is a copolymer obtained and/or are obtainable from (a) one or more C1-14alkyl(meth)acrylate(s) (b) one or more polybutadiene derived polyol(s);
- hydrogenated polybutadiene derived difunctional polyol(s);
- poly(ethylene/butylene) derived difunctional polyol(s);
- non-crystalline polyether glycol(s);
- and (c) one or more poly-functional compounds comprising hindered, tertiary carboxylic acid group(s) therein and a plurality of reactive, primary hydroxy groups.
Dependencies are inferred from the claim text.