Patent US4695602A successfully refreshed from Google Patents.
US4695602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced thermoplastics containing silicone interpenetrating polymer networks
Assignee: KAWASAKI STEEL PLASTICS Inc A CORP OF DELAWARE
•
Filing: 1985-02-28
•
Granted: 1987-09-22
•
Expires: 2005-02-28
Abstract
Abstract The detrimental effects of reinforcing fibers on the differential shrinkage and warpage characteristics of thermoplastic resins are substantially reduced by the incorporation of a silicone interpenetrating polymer network in fiber reinforced thermoplastic composites. High modulus (flexural modulus greater than 90,000 psi) thermoplastic matrices containing about 5 to 60 weight percent reinforcing fibers and 1 to 20 weight percent of a silicone IPN have reduced shrinkage and warpage and more isotropic mold shrinkage than conventional fiber reinforced thermoplastics, and are particularly useful in the melt forming of high tolerance parts, such as gears, as well as thin walled, variable thickness and thick cross section parts.
Inventors
- 👤 Jane M. Crosby
- 👤 MaryGail K. Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08L; C08L101/00; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
108 words
A melt processable composition comprising: a. a thermoplastic matrix material comprising a thermoplastic which has an unfilled flexural modulus greater than 90,000 psi; b. a hydride group-containing silicone and a component which will react with said hydride group-containing silicone, said silicone and said component being selected and present in sufficient amounts to react with each other by vulcanization within said thermoplastic matrix to form a silicone semi-interpenetrating polymer network, said vulcanization of said silicone and said component being initiated during thermoplastic melt-processing of said silicone and said component with said matrix; and c. a fibrous reinforcing agent mixed with said matrix material, said silicone and or said component.
Claim 2
Dependent Claim
108 words
A melt processable composition comprising: a. a thermoplastic matrix material comprising a thermoplastic which has an unfilled flexural modulus greater than 90,000 psi; b. a hydride group-containing silicone and a component which will react with said hydride group-containing silicone, said silicone and said component being selected and present in sufficient amounts to react with each other by vulcanization within said thermoplastic matrix to form a silicone semi-interpenetrating polymer network, said vulcanization of said silicone and said component being initiated during thermoplastic melt-processing of said silicone and said component with said matrix; and c. a fibrous reinforcing agent mixed with said matrix material, said silicone and or said component.
Claim 3
Dependent Claim
21 words
A melt processable composition according to claim 1 including a catalyst to catalyze the reaction of said silicone and said component.
Claim 4
Dependent Claim
15 words
A melt processable composition according to claim 2 wherein said catalyst is a platinum catalyst.
Claim 5
Dependent Claim
42 words
A melt processable composition according to claim 1 wherein said thermoplastic matrix 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 ether ketones, polyacrylics, polyamide-imides, and polyvinyl chloride.
Claim 6
Dependent Claim
36 words
A melt processable composition according to claim 1 wherein said fibrous reinforcing agent is selected from the group consisting of glass, carbon, aramid, ceramic, boron, metal, and reinforcing mineral fibers other than glass and ceramic fibers.
Claim 7
Dependent Claim
26 words
A melt processable composition according to claim 5 wherein said fibers are present in an amount of about 5 to 60 weight percent of the composition.
Claim 8
Dependent Claim
38 words
A melt processable composition according to claim 1 which also includes a modifier selected from the group consisting of glass beads, particulate minerals, flame retardant additives, lubricants, bismuth salts, metal powders, carbon powders, aluminum flakes, and magnetic powders.
Claim 9
Dependent Claim
26 words
A melt processable composition according to claim 7 wherein said modifier is present in an amount of about 1 to 40 weight percent of the composition.
Claim 10
Dependent Claim
22 words
A melt processable composition according to claim 1 wherein said network comprises about 1 to 20 weight percent of the total composition.
Claim 11
Dependent Claim
30 words
A melt processable composition 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 12
Dependent Claim
16 words
A melt processable composition according to claim 10 wherein said unsaturated group comprises a vinyl group.
Claim 13
Dependent Claim
18 words
A melt processable composition according to claim 11 wherein the vinyl group is on a polymeric silicone compound.
Claim 14
Dependent Claim
17 words
A melt processable composition according to claim 11 wherein the vinyl group is on a vinyl polymer.
Claim 15
Dependent Claim
73 words
A melt formed composite having reduced mold shrinkage and warpage, comprising (a) A thermoplastic matrix comprising a thermoplastic resin having an unfilled flexural modulus greater than 90,000 psi; (b) a silicone interpenetrating polymer network vulcanized within said thermoplastic matrix, said network comprising the reaction product of a hydride group-containing silicone and a component which will react with said hydride group-containing silicone; and (c) a fibrous reinforcing agent uniformly dispersed in said thermoplastic matrix.
Claim 16
Dependent Claim
73 words
A melt formed composite having reduced mold shrinkage and warpage, comprising (a) A thermoplastic matrix comprising a thermoplastic resin having an unfilled flexural modulus greater than 90,000 psi; (b) a silicone interpenetrating polymer network vulcanized within said thermoplastic matrix, said network comprising the reaction product of a hydride group-containing silicone and a component which will react with said hydride group-containing silicone; and (c) a fibrous reinforcing agent uniformly dispersed in said thermoplastic matrix.
Claim 17
Dependent Claim
42 words
A melt formed composite according to claim 14 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 ether ketones, polyacrylics, polyamide-imides, and polyvinyl chloride.
Claim 18
Dependent Claim
36 words
A melt formed composite according to claim 14 wherein said fibrous reinforcing agent is selected from the group consisting of glass, carbon, aramid, ceramic, boron, metal, and reinforcing mineral fibers other than glass and ceramic fibers.
Claim 19
Dependent Claim
23 words
A melt formed composite according to claim 14 wherein said fibrous reinforcing agent comprises about 5 to 60 weight percent of the composite.
Claim 20
Dependent Claim
24 words
A melt formed composite according to claim 14 wherein said silicone interpenetrating polymer network comprises about 1 to 20 weight percent of the composite.
Claim 21
Dependent Claim
29 words
A melt formed composite according to claim 14 wherein said silicon interpenetrating polymer network is the reaction product of a hydride group-containing silicone and a polymer containing unsaturated groups.
Claim 22
Dependent Claim
14 words
A melt formed composite according to claim 14 in the form of a gear.
Claim 23
Independent Claim
98 words
A method of reducing mold shrinkage and warpage in a thermoplastic molding resin having an unfilled flexural modulus greater than 90,000 psi and a fibrous reinforcing agent uniformly dispersed in said thermoplastic molding resin, 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 fiber-reinforced part.
Claim 24
Independent Claim
98 words
A method of reducing mold shrinkage and warpage in a thermoplastic molding resin having an unfilled flexural modulus greater than 90,000 psi and a fibrous reinforcing agent uniformly dispersed in said thermoplastic molding resin, 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 fiber-reinforced part.
Claim 25
Dependent Claim
22 words
A method according to claim 21 wherein said molded part is a high tolerance, thin walled, variable thickness, or thick cross-section part.
References Cited (Backward Citations)
US3288879A
Cited
US3960985A
Cited
US4230815A
Cited
US4265801A
Cited
US4221728A
Cited
US4373038A
Cited
US4412032A
Cited
US4393161A
Cited
US4500688A
Cited
US4465804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |