Preparation and use of crosslinkable acrylosilane polymers containing vinyl silane monomers
AssigneeE. I. du Pont Nemours and Company
InventorsDonald A. Paquet JR., Ding-Yu Chung, Isidor Hazan
Life of this patent
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Abstract
Acrylosilane polymers containing vinyl silanes are prepared by copolymerizing vinyl alkoxy silane monomers predominantly with, or in the alternative, only with acrylate monomers. The polymer so prepared can be used as the main component in the acid etch resistant solvent borne coating compositions and in particular in clear coating compositions for clear coat/color coat finishes for automobiles and trucks.
Claims12
A crosslinkable acrylosilane polymer composition having a weight average molecular weight below about 40,000, derived from A, B and optionally C, wherein:
- (A) is about 5 to 75% by weight, based on the weight of the acrylosilane polymer, of a vinyl alkoxy silane monomer represented by the general formula
- 3
- wherein R1 is an aryl or alkyl group having 1 to 10 carbon atoms, R2 is a hydrolysable group, m is 0 or 1, and n is 0 or a positive integer from 1 to 10;
- (B) is about 25 to 95% by weight, based on the weight of the acrylosilane polymer, of one or more of polymerizable monomers selected from the group consisting of esters of acrylic acid;
- and
- (C) is about 0 to 70% by weight, based on the weight of the acrylosilane polymer, of ethylenically unsaturated copolymerizable monomers other than (A) and (B) selected from the group consisting of styrenic monomers, esters of methacrylic acid, and mixtures thereof.
A process for preparing acrylosilane polymers containing vinyl alkoxy silane monomers, which comprises copolymerizing A with B and optionally C, wherein:
- (A) is about 5 to 75% by weight, based on the weight of the acrylosilane polymer, of polymerized vinyl alkoxy silane monomers represented by the general formula
- 4
- wherein R1 is an aryl or alkyl group having 1 to 10 carbon atoms, R2 is a hydrolysable group, m is 0 or 1, and n is 0 or a positive integer from 1 to 10;
- (B) is about 25 to 95% by weight, based on the weight of the acrylosilane polymer, of polymerized monomers selected from the group consisting of esters of acrylic acid, and
- (C) is about 0 to 70% by weight, based on the weight of the acrylosilane polymer, of polymerized ethylenically unsaturated monomers other than (A) and (B) selected from the group consisting of styrenic monomers, esters of methacrylic acid and mixtures thereof.
A coating composition containing about 40-90% by weight of film forming binder and 10-60% by weight of an organic liquid carrier;
- wherein the binder contains:
- (i) about 20-80% by weight, based on the weight of the binder, of an acrylosilane containing
- (A) about 5-75% by weight, based on the weight of the acrylosilane polymer, of polymerized vinyl alkoxy silane monomers represented by the general formula
- 5
- wherein R1 is an aryl or alkyl group having 1 to 10 carbon atoms, R2 is a hydrolysable group, m is 0 or 1, and n is 0 or a positive integer from 1 to 10;
- (B) about 25-95% by weight, based on the weight of the acrylosilane polymer, of polymerized monomers selected from the group consisting of esters of acrylic acid;
- and
- (C) about 0-70% by weight, based on the weight of the acrylosilane polymer, of polymerized monomers selected from ethylenically unsaturated monomers other than (A) and (B) selected from one or both of styrenic monomers and esters of methacrylic acid and the polymer has a weight average molecular weight of about 1,000-30,000;
- (ii) about 10-40% by weight, based on the weight of the binder, of a non-aqueous dispersed polymer having
- (A) a macromolecular core having a weight average molecular weight of about 50,000-500,000, and
- (B) attached to the macromolecular core, a plurality of macromonomer chains having a weight average molecular weight of about 1,000-30,000 of 5-30% by weight, based on the weight of the macromonomer, of polymerized ethylenically unsaturated monomers which have functional groups selected from the group consisting of epoxide, anhydride, isocyanate, silane, acid, hydroxy, amide or any combination of these groups;
- and about 70-95% by weight, based on the weight of the macromonomer, of at least one other polymerized ethylenically unsaturated monomer without a crosslinking functionality;
- and
- (iii) about 10-70% by weight, based on the weight of the binder, of a crosslinking agent selected from one or both of an isocyanate and melamine crosslinker.
Dependencies are inferred from the claim text.