Patent Number: 6,251,962

Title: (Co)polymers by photopolymerization

Abstract: A Process for the selective preparation acrylate- or methacrylate-homo- or acrylate- or methacrylate-co-oligomers with a weight average molecular weight (Mw) from 1000 to 20000, a polydispersity.ltoreq.3 and a conversion of the monomers to polymers greater than or equal to 70%, or for the selective preparation of polyvinylacetate and its hydrolysis product polyvinylalcohol with a weight average molecular weight (Mw) from 1000 to 25000, a polydispersity.ltoreq.3 and a conversion of the monomers to polymers greater than or equal to 70%, is characterized in that a mixture of the corresponding monomers is irradiated in the presence of a specific photoinitiator or photoinitiator mixture at a temperature from -20 to 70.degree. C. in an inert solvent or inert solvent mixture, with light of a wavelength from 305 to 450 nm, wherein the contents of monomers in the reaction mixture is up to 70%.

Inventors: Desobry; Vincent (Marly, CH)

Assignee: Ciba Specialty Chemicals Corporation

International Classification: C08F 20/00 (20060101); C08F 20/12 (20060101); C08F 002/50 (); C08F 002/48 (); C08F 020/18 (); C08F 018/08 ()

Expiration Date: 06/26/2018