Kenneth Allan Holtzman

US Patent:

41918002, Mar 4, 1980

Filed:

Jul 26, 1978

Appl. No.:

5/928067

Inventors:

Kenneth A. Holtzman - Clifton NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

B32B 2712
B32B 1710

US Classification:

428251

Abstract:

Processes and devices are described which employ flexible substrates made from cloth impregnated with a resin of a particular composition. The flexible substrate is made into double-clad printed wiring substrate for use in double-sided circuits. These substrates exhibit excellent dimensional stability during circuit fabrication and soldering as well as excellent flame retardance and electrical insulation resistance.

US Patent:

40653684, Dec 27, 1977

Filed:

Feb 23, 1976

Appl. No.:

5/660473

Inventors:

Kenneth Allan Holtzman - Clifton NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

C08F 246
C08L 9100

US Classification:

20415923

Abstract:

A flexible photopolymerizable resin is prepared in a two-stage process by the esterification of castor oil which chlorendic anhydride to yield a chlorendic anhydride half ester and the subsequent reaction of the half ester with a reagent having acrylic functionality, a cure retardant and an acrylic functional monomer. The resultant acrylic ester evidences superior insulation resistance during aging.