Ramesh L Mehta

US Patent:

54436745, Aug 22, 1995

Filed:

Aug 31, 1992

Appl. No.:

7/938872

Inventors:

Flavia M. Fresonke - Spring Lake Park MN
Ramesh Mehta - Roseville MN

Assignee:

H. B. Fuller Licensing & Financing Inc. - Wilmington DE

International Classification:

C09J 400

US Classification:

1563317

Abstract:

A method of binding book blocks to form books is disclosed. The method involves applying an aqueous composition to the spine area of a book block and removing the volatile components of the composition. The composition comprises (1) an aqueous vehicle, a film-forming polymeric resin, and a polyurethane resin or (2) an aqueous polyurethane dispersion or emulsion. The composition may also include an alkaline component. In another embodiment, the composition comprises a mixture of an aqueous, film-forming polymeric latex, an alkaline component to adjust the pH the latex to that of an aqueous polyurethane dispersion, and the aqueous polyurethane dispersion.

US Patent:

40827089, Apr 4, 1978

Filed:

Sep 20, 1976

Appl. No.:

5/725012

Inventors:

Ramesh Mehta - Roseville MN

Assignee:

H. B. Fuller Company - St. Paul MN

International Classification:

C08G 5944

US Classification:

260 18N

Abstract:

The disclosed adhesive system comprises a curable liquid epoxide and a bisamino piperazine-containing thermoplastic polyamide hardener or co-curative. This adhesive system forms high strength metal-to-metal bonds with unusually high T-peel strength, high tensile shear strength, excellent low temperature properties, and good impact resistance while possessing the fast assembly speed characteristics of a hot melt. Both two-part and stable one-part curable systems can be formulated from (a) suitable epoxy resins and (b) the bisamino piperazine-containing thermoplastic polyamide. The particularly preferred polyamide comprises the amidification product, at temperatures of from 180. degree. C. to 300. degree. C. , of: (a) from about 25-35% by weight of a diamine component comprising: (1) from about 45-65 equivalent percent of 1,4-Bis(3-aminopropyl) piperazine; (2) from about 15-35 equivalent percent polyoxypropylene diamine containing about 2 to about 35 repeating oxypropylene units; (3) from about 15-35 equivalent percent piperazine; (b) from about 65-75% by weight of a dicarboxylic acid component comprising: (1) from about 70-100 equivalent percent polymerized tall oil fatty acid having a dimeric fatty acid content greater than 90% by weight; (2) from about 0-30 equivalent percent azelaic acid.