US4452943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoforming of thermoplastic polymers
Assignee: Individual
•
Filing: 1974-01-16
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Granted: 1984-06-05
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Expires: 1994-01-16
Abstract
Abstract A process for dielectrically heating and thermoforming a non-polar thermoplastic material by electromagnetic field energy is accomplished by the addition of a polar domain-containing material having at least one nitrile group to the thermoplastic material. Compositions comprising thermoplastic material and a polar domain containing material useful in this process are also described.
Inventors
- 👤 Conrad Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:54
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08K; C08K5/00; C08K5/16; C08K5/29
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
140 words
A polymeric composition consisting essentially of (a) from about 80% to about 99% of a thermoplastic polymer selected from the group consisting of a polyethylene, a polypropylene, a copolymer of butadiene and styrene, a copolymer of ethylene and propylene, a polystyrene, a natural rubber, a polybutadiene, an admixture of an acrylonitrile-styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer, and admixture of an acrylonitrile-styrene copolymer with a butadiene-methacrylonitrile copolymer, an admixture of an acrylonitrile-αmethyl styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer, an admixture of an acrylonitrile-αmethyl styrene copolymer with a butadiene methacrylonitrile copolymer, a polysiloxane and a polyisobutylene, said polymer having a dissipation factor of less than 0.01 and (b) from about 1% to about 20% of a polar domain containing material selected from the group consisting of polyacrylonitrile and an acrylonitrile-butadiene copolymer, said material having a nitrile group content of at least 14.7%.
Claim 2
Dependent Claim
140 words
A polymeric composition consisting essentially of (a) from about 80% to about 99% of a thermoplastic polymer selected from the group consisting of a polyethylene, a polypropylene, a copolymer of butadiene and styrene, a copolymer of ethylene and propylene, a polystyrene, a natural rubber, a polybutadiene, an admixture of an acrylonitrile-styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer, and admixture of an acrylonitrile-styrene copolymer with a butadiene-methacrylonitrile copolymer, an admixture of an acrylonitrile-αmethyl styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer, an admixture of an acrylonitrile-αmethyl styrene copolymer with a butadiene methacrylonitrile copolymer, a polysiloxane and a polyisobutylene, said polymer having a dissipation factor of less than 0.01 and (b) from about 1% to about 20% of a polar domain containing material selected from the group consisting of polyacrylonitrile and an acrylonitrile-butadiene copolymer, said material having a nitrile group content of at least 14.7%.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein the thermoplastic polymer is polyethylene.
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein the thermoplastic polymer is polypropylene.
Claim 5
Dependent Claim
16 words
The composition of claim 1 wherein the thermoplastic polymer is a copolymer of butadiene and styrene.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein the thermoplastic polymer is a copolymer of ethylene and propylene.
Claim 7
Dependent Claim
10 words
The composition of claim 1 wherein the thermoplastic is polystyrene.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein the thermoplastic polymer is natural rubber.
Claim 9
Dependent Claim
11 words
The composition of claim 1 wherein the thermoplastic polymer is polybutadiene.
Claim 10
Dependent Claim
11 words
The composition of claim 1 wherein the thermoplastic polymer is polysiloxane.
Claim 11
Dependent Claim
12 words
The composition of claim 1 wherein the thermoplastic polymer is butyl rubber.
Claim 12
Dependent Claim
20 words
The composition of claim 1 wherein the thermoplastic polymer is an admixture of an acrylonitrile-styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer.
Claim 13
Dependent Claim
20 words
The composition of claim 1 wherein the thermoplastic polymer is an admixture of an acrylonitrile-styrene copolymer with a butadiene-methacrylonitrile copolymer.
Claim 14
Dependent Claim
21 words
The composition of claim 1 wherein the thermoplastic polymer is an admixture of an acrylonitrile-αmethyl styrene copolymer with an acrylonitrile-butadiene-styrene terpolymer.
Claim 15
Dependent Claim
21 words
The composition of claim 1 wherein the thermoplastic polymer is an admixture of an acrylonitrile-αmethyl styrene copolymer with a butadiene-methacrylonitrile copolymer.
Claim 16
Dependent Claim
41 words
A thermoplastic polymeric composition consisting essentially of from about 80% to 99% of polyethylene having a dissipation factor of less than 0.01 and from about 1% to about 20% of acrytonitrile-butadiene copolymer having a nitrile group content of at least 14.7%.
Claim 17
Dependent Claim
41 words
A thermoplastic polymeric composition consisting essentially of from about 80% to 99% of polyethylene having a dissipation factor of less than 0.01 and from about 1% to about 20% of acrytonitrile-butadiene copolymer having a nitrile group content of at least 14.7%.
Claim 18
Dependent Claim
48 words
A process for increasing the dissipation factor of a thermoplastic polymer having a dissipation factor of less than 0.01 consisting of adding thereto from 1% to 20% by weight of the total composition, a polymeric polar domain containing material having a nitrile group content of at least 14.7%.
Claim 19
Dependent Claim
48 words
A process for increasing the dissipation factor of a thermoplastic polymer having a dissipation factor of less than 0.01 consisting of adding thereto from 1% to 20% by weight of the total composition, a polymeric polar domain containing material having a nitrile group content of at least 14.7%.
Claim 20
Dependent Claim
29 words
The process of claim 16 wherein the thermoplastic polymer is selected from the group consisting of a vinyl polymer, a condensation polymer, a silicone resin and a natural resin.
Claim 21
Dependent Claim
11 words
The process of claim 16 wherein the thermoplastic polymer is polyethylene.
Claim 22
Dependent Claim
11 words
The process of claim 16 wherein the thermoplastic polymer is polypropylene.
Claim 23
Dependent Claim
11 words
The process of claim 16 wherein the thermoplastic polymer is polystyrene.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |