Shawn E Lambert

US Patent:

58612300, Jan 19, 1999

Filed:

Apr 21, 1997

Appl. No.:

8/843817

Inventors:

Shawn P. Lambert - Marlborough MA
Xiaojia Z. Wang - Acton MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C08L 108
C08L 7700

US Classification:

430202

Abstract:

There is described a novel process of polymerizing 4-vinyl pyridine monomer in an aqueous polymerization system which comprises preparing an aqueous solution of polyvinyl alcohol, and contacting said aqueous solution of a polyvinyl alcohol with less than about 10% by weight of 4-vinyl pyridine monomer and a water-soluble initiator capable of decomposing to give free radicals. The resultant dispersion of the novel polymerization process comprises a homogeneous, i. e. , weight average molecular weight and particle size, poly-4-vinylpyridine, with no appreciable residual 4-vinyl pyridine monomer. The resultant dispersion may be used to coat image- and ink-receiving layers of image-recording materials and ink jet recording sheets, respectively.

US Patent:

59423358, Aug 24, 1999

Filed:

Apr 21, 1997

Appl. No.:

8/843736

Inventors:

Yung T. Chen - Lexington MA
Gerald P. Harwood - Billerica MA
Shawn P. Lambert - Marlborough MA
Kenneth J. McCarthy - Duxbury MA
Richard J. Murphy - Dennisport MA
Michael S. Viola - Burlington MA
Xiaojia Z. Wang - Acton MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 500

US Classification:

428500

Abstract:

An ink jet recording sheet comprises a support carrying an ink-receiving layer, this layer comprising a hydrophilic polymer, preferably poly(vinyl alcohol) and a poly(vinylpyridine). The images formed using this sheet display good water fastness.