Susan E Ward

US Patent:

48494690, Jul 18, 1989

Filed:

Sep 21, 1987

Appl. No.:

7/099193

Inventors:

Jane M. Crosby - Wilmington DE
MaryGail K. Hutchins - Philadelphia PA
Susan K. Ward - Phoenixville PA

Assignee:

ICI Americas Inc. - Wilmington DE

International Classification:

C08L 5900
C08L 6900
C08K 716
C08K 704

US Classification:

524439

Abstract:

Thermoplastic compositions and composites are produced which have fewer and smaller voids with more consistent dimensions compared to conventional unreinforced and fiber reinforced thermoplastics. The high modulus thermoplastic contains silicone semi-interpenetrating polymer networks which are formed by vulcanization within the thermoplastic and initiated during melt processing. Parts molded from the compositions are more homogeneous, with evenly distributed voids, thus reducing the possibility of strss fractures. The compositions are particularly useful in the molding in thick cross-section and variable thickness parts and have been found to have increased thermal stability.

US Patent:

48310719, May 16, 1989

Filed:

Sep 21, 1987

Appl. No.:

7/099185

Inventors:

Susan K. Ward - Phoenixville PA
Gregory S. O'Brien - Malvern PA

Assignee:

ICI Americas Inc. - Wilmington DE

International Classification:

C08L 8300
C08L 7700
C08K 714
C08K 706

US Classification:

524401

Abstract:

High modulus thermoplastic compositions and composites are produced which exhibit enhanced melt integrity and strength, allowing the composites to be melt-drawn to smooth surfaced, high tolerance profiles, such as thin-walled tubing, wire, coatings, films, etc. The melt integrity is improved by adding to the thermoplastic prior to or during thermoplastic melt processing a silicone component which will be vulcanized within the thermoplastic to form a silicone semi-interpenetrating polymer network initiated during the melt processing of the thermoplastic. The composition contains about 0. 1 to 20, and preferably about 1 to 4 weight percent of the silicone network, and may also contain fibrous reinforcement and/or filler/modifiers.