Patent US4849469A successfully refreshed from Google Patents.
US4849469A
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Void control in thermoplastics containing silicone interpenetrating polymer networks
Assignee: KAWASAKI STEEL PLASTICS Inc A CORP OF DELAWARE
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Filing: 1987-09-21
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Granted: 1989-07-18
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Expires: 2007-09-21
Abstract
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.
Inventors
- 👤 Jane M. Crosby
- 👤 MaryGail K. Hutchins
- 👤 Susan K. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:14
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; B; B29; B29C; B29C48/00; B29C48/022; C08L; C08L101/00; B29C48/03; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A method of molding high tolerance, thin walled, variable thickness or thick cross-section parts with reduced void formation with a thermoplastic molding resin having an unfilled flexural modulus greater than 90,000 psi comprising adding to said thermoplastic resin prior to or during thermoplastic melt processing a silicone component which will be vulcanized by the reaction of a hydride-containing silicone within said thermoplastic resin to form a silicone semi-interpenetrating polymer network, initiating the vulcanization of said silicone component by thermoplastic melt processing of said component within said thermoplastic resin, and molding said resin into a part.
Claim 2
Independent Claim
95 words
A method of molding high tolerance, thin walled, variable thickness or thick cross-section parts with reduced void formation with a thermoplastic molding resin having an unfilled flexural modulus greater than 90,000 psi comprising adding to said thermoplastic resin prior to or during thermoplastic melt processing a silicone component which will be vulcanized by the reaction of a hydride-containing silicone within said thermoplastic resin to form a silicone semi-interpenetrating polymer network, initiating the vulcanization of said silicone component by thermoplastic melt processing of said component within said thermoplastic resin, and molding said resin into a part.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein said thermoplastic resin is selected from the group consisting of polyamides, polycarbonates, polystyrene, styrene-acrylonitrile copolymers, acrylonitrile-styrene-butadiene copolymers, polyacetals, polyolefins, polyesters, polysulfones, polyphenylene sulfides, fluoropolymers, polyetherimides, polyether ketones, polyacrylics, polyamide-imides, and polyvinyl chloride.
Claim 4
Dependent Claim
37 words
A method according to claim 1 wherein said resin contains a filler selected from the group consisting of glass beads, particulate minerals, flame retardant additives, lubricants, bismuth salts, metal powders and magnetic powders, carbon powders, aluminum flakes.
Claim 5
Dependent Claim
20 words
A method according to claim 1 wherein said network comprises about 1 to 20 weight percent of the total composition.
Claim 6
Dependent Claim
28 words
A method according to claim 1 wherein said network comprises the reaction product of a polymeric hydride group-containing silicone and a polymer containing at least one unsaturated group.
Claim 7
Dependent Claim
19 words
A method according to claim 5 including a catalyst to catalyze the reaction of said silicone and said polymer.
Claim 8
Dependent Claim
13 words
A method according to claim 6 wherein said catalyst is a platinum catalyst.
Claim 9
Dependent Claim
13 words
A method according to claim 1 wherein said melt processing includes injection molding.
Claim 10
Dependent Claim
13 words
A method according to claim 1 wherein said melt processing includes sheet extrusion.
Claim 11
Dependent Claim
13 words
A method according to claim 1 wherein said melt processing includes profile extrusion.
Claim 12
Dependent Claim
13 words
A method according to claim 1 wherein said melt processing includes blow molding.
Claim 13
Dependent Claim
13 words
A method according to claim 1 wherein said melt processing includes vacuum forming.
Claim 14
Dependent Claim
19 words
A molded part produced according to the method of claim 1 wherein said voids are small and evenly distributed.
Claim 15
Dependent Claim
12 words
A thick cross-section part produced according to the method of claim 1.
Claim 16
Dependent Claim
12 words
A variable thickness part produced according to the method of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |