Patent ID: 6881858

Claim:
A method for preparing an asymmetric (meth)acrylate crosslinking agent comprising reacting an hydroxyacrylate of formula (II) CH 2 ═CHC(O)O—[—(CH 2 ) x —CHR—O—] n —H (II) with methacrylic anhydride to form an asymmetric (meth)acrylate crosslinking agent of formula (I) and methacrylic acid CH 2 ═CHC(O)O—[—(CH 2 ) x —CHR—O—] n —C(O)CCH 3 ═CH 2 (I) wherein, x=1, 2, or 3, R=H or CH 3 , and n≈1-100; wherein a reaction product containing the asymmetric (meth)acrylate crosslinking agent comprises less than 2 wt. % of a diacrylate, dimethacrylate, or mixture thereof.