Olefin-acrylate copolymers with pendant hydroxyl functionality and use thereof
AssigneeHenkel IP & Holding GmbH
InventorsLaxmisha Sridhar, Smita Shah, John G. Woods, Anthony F. Jacobine
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Abstract
Copolymers prepared by a reaction of (1) an unactivated olefin, (2) an activated olefin, and (3) a hydroxyl functional activated olefin and/or a hydroxyl functional unactivated olefin are described. The copolymers have a backbone of polar vinyl monomers and non-polar alkene monomers, with pendant hydroxyl functional groups. The copolymers are well suited for optically clear, pressure sensitive, polyurethane and/or barrier adhesives.
Claims16
A copolymer prepared by the reaction of:
- (A) 10-89 mol % of an unactivated olefin;
- (B) 10-89 mol % of an activated olefin;
- and
- (C) 1-50 mol % of a hydroxyl functional unactivated olefin selected from the group consisting of allyl alcohol, 3-buten-1-ol, 4-penten-1-ol, 5-hexen-1-ol, 9-decen-1-ol, 10-undecen-1-ol, and mixtures thereof;
- wherein the total mol % is 100 mol %;
- wherein the copolymer comprises a plurality of pendant hydroxyl groups;
- and
- wherein the weight average molecular weight (Mw) is from about 84,000 to about 2,000,000.
A method of forming a copolymer having a backbone of olefin-acrylate with pendant hydroxyl functionality comprising the steps of:
- (1) pre-complexing a first amount of an activated olefin and a Lewis acid to form a pre-complex;
- (2) adding the pre-complex to a solution of (i) an unactivated olefin, (ii) a second amount of the activated olefin, and (iii) a hydroxyl functional unactivated olefin in (iv) a solvent to form a mixture;
- and
- (3) polymerizing the mixture in a temperature range of −78° C. to 100° C.;
- wherein the first amount of the activated olefin is an equimolar amount of the activated olefin with the Lewis acid, and the second amount of the activated olefin is the rest of the molar amount of the activated olefin;
- wherein the amount of Lewis acid ranges from about 1 to about 99 mol % of the activated olefin;
- wherein the copolymer is the reaction product of:
- (A) 10-89 mol % of an unactivated olefin;
- (B) 10-89 mol % of an activated olefin;
- and
- (C) 1-50 mol % of a hydroxyl functional unactivated olefin selected from the group consisting of allyl alcohol, 3-buten-1-ol, 4-penten-1-ol, 5-hexen-1-ol, 9-decen-1-ol, 10-undecen-1-ol, and mixtures thereof;
- wherein the total mol % is 100 mol %;
- wherein the copolymer comprises a plurality of pendant hydroxyl groups;
- and
- wherein the weight average molecular weight (Mw) is from about 84,000 to about 2,000,000.
A pressure sensitive hot melt adhesive comprising:
- (i) a copolymer prepared by the reaction of:
- (A) 10-89 mol % of an unactivated olefin;
- (B) 10-89 mol % of an activated olefin;
- and
- (C) 1-50 mol % of a hydroxyl functional unactivated olefin selected from the group consisting of allyl alcohol, 3-buten-1-ol, 4-penten-1-ol, 5-hexen-1-ol, 9-decen-1-ol, 10-undecen-1-ol, and mixtures thereof;
- wherein the total mol % is 100 mol %;
- wherein the copolymer comprises a plurality of pendant hydroxyl groups;
- and
- wherein the weight average molecular weight (Mw) is from about 84,000 to about 2,000,000;
- and
- (ii) optionally, tackifier, plasticizer, antioxidant, inorganic fillers, desiccants, and/or adhesion promoters;
- wherein the pressure sensitive hot melt adhesive is optically clear.
Dependencies are inferred from the claim text.