EP0601783A1
Expired / Lapsed
EP
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Blowing agent concentrate
Assignee: General Electric Co
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Filing: 1993-12-01
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Granted: —
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Expires: 2013-12-01
Abstract
Abstract The present invention includes an improved blowing agent concentrate, comprising: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent. The blowing agent concentrate is utilized to prepare foamable materials based on a variety of thermoplastic organic polymers. The foamable materials can in turn be molded into a variety of thermoplastic structures.
Inventors
- 👤 Ann Marie Burnell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/06; C08J2325/00; C08J2325/02; C08J2453/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
36 words
An improved blowing agent concentrate for thermoplastic polymers, comprising: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent.
Claim 2
Dependent Claim
36 words
An improved blowing agent concentrate for thermoplastic polymers, comprising: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent.
Claim 3
Dependent Claim
116 words
The concentrate of claim 1, wherein at least about 25% of the vinyl aromatic units in component (a) are derived from an alkenyl aromatic monomer of the formula wherein R¹ and R² are selected from the group consisting of hydrogen and lower alkyl or alkenyl groups of from 1 to 6 carbon atoms; R³ and R⁴ are selected from the group consisting of hydrogen and lower alkyl groups of from 1 to 6 carbon atoms; and R⁵ and R⁶ are selected from the group consisting of hydrogen and lower alkyl and alkenyl groups of from 1 to 6 carbon atoms; or R⁵ and R⁶ can be concatenated together with hydrocarbyl groups to form a naphthyl group.
Claim 4
Dependent Claim
33 words
The blowing agent concentrate of claim 2, wherein the vinyl aromatic polymer of component (a) is selected from the group consisting of homopolystyrene; poly-α-methylstyrene; a styrene maleic anhydride copolymer; and a styrene-acrylonitrile copolymer.
Claim 5
Dependent Claim
10 words
The concentrate of claim 1, wherein component (a) is rubber-modified.
Claim 6
Dependent Claim
29 words
The concentrate of claim 4, wherein component (a) is butadiene-modified homopolystyrene; and the weight ratio of butadiene to homopolystyrene is in the range of about 1:99 to about 20:80.
Claim 7
Dependent Claim
19 words
The concentrate of any preceding claim, wherein the styrene/ diene block copolymer of component (b) is linear or branched.
Claim 8
Dependent Claim
26 words
The concentrate of any preceding claim, wherein the hydrocarbon rubber extending oil is selected from the group consisting of paraffinic oils, naphthenic oils, and mixtures thereof.
Claim 9
Dependent Claim
24 words
The concentrate of any preceding claim, wherein the styrene/ diene ratio for component (b) is in the range of about 25:75 to about 55:45.
Claim 10
Dependent Claim
31 words
The concentrate of any preceding claim, wherein the level of extending oil ranges from about 5% by weight to about 55% by weight, based on the total weight of component (b).
Claim 11
Dependent Claim
22 words
The concentrate of claim 9, wherein the level of extending oil ranges from about 25% by weight to about 50% by weight.
Claim 12
Dependent Claim
45 words
The concentrate of any preceding claim, wherein the blowing agent of component (c) is selected from the group consisting of hydrazodicarboxylates, benzamides, amide derivatives of azodicarboxylic acid; hydrocerol, sodium borohydride, sodium bicarbonate-based compounds; aluminum hydroxide-based compounds; dihydrooxadiazinone-based compounds; and mixtures of any of the foregoing.
Claim 13
Dependent Claim
39 words
The concentrate of claim 11, wherein the amide derivatives of azodicarboxylic acid are compounds represented by the formula wherein R³ and R⁴ are independently selected from hydrogen and alkyl groups having from about 1 to about 10 carbon atoms.
Claim 14
Dependent Claim
12 words
13 The concentrate of claim 12, wherein the blowing agent is azodicarbonamide.
Claim 15
Dependent Claim
27 words
The concentrate of any preceding claim, wherein component (a) is present at a level of at least about 65%, based on the weight of the entire concentrate.
Claim 16
Dependent Claim
39 words
The concentrate of any preceding claim, wherein the blowing agent of component (c) is present at a level in the range of about 1% by weight to about 20% by weight, based on the weight of the entire concentrate.
Claim 17
Dependent Claim
11 words
The concentrate of any preceding claim, further comprising a poly(tetrafluoroethylene) resin.
Claim 18
Dependent Claim
35 words
The concentrate of claim 16, wherein the poly(tetrafluoroethylene) resin is present at a level in the range of about 0.01% by weight to about 2.0% by weight, based on the weight of the entire concentrate.
Claim 19
Dependent Claim
49 words
A foamable composition which comprises a thermoplastic organic polymer as a base resin, and a blowing agent concentrate which itself comprises: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent compound.
Claim 20
Dependent Claim
49 words
A foamable composition which comprises a thermoplastic organic polymer as a base resin, and a blowing agent concentrate which itself comprises: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent compound.
Claim 21
Dependent Claim
16 words
The foamable composition of claim 18, wherein component (c) is an amide derivative of azodicarboxylic acid.
Claim 22
Dependent Claim
58 words
The foamable composition of claim 18, wherein the thermoplastic organic polymer is selected from the group consisting of polyimides, polyphenylene sulfide, styrene-acrylonitrile copolymers, acrylic-styreneacrylonitrile terpolymers; acrylonitrile-butadiene-styrene (ABS) terpolymers, polycarbonates; alloys of polycarbonate and ABS; polyphenylene ether-based resins; polyamide resins; polystyrene-based resins; polyesters; elastomeric polyesters; polyolefins; blends of any of the foregoing; and copolymers of any of the foregoing.
Claim 23
Dependent Claim
56 words
A foamed, thermoplastic structure molded from a composition which comprises: (I) a thermoplastic organic polymer as a base resin, and (II) a blowing agent concentrate which itself comprises: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent compound.
Claim 24
Dependent Claim
56 words
A foamed, thermoplastic structure molded from a composition which comprises: (I) a thermoplastic organic polymer as a base resin, and (II) a blowing agent concentrate which itself comprises: (a) a vinyl aromatic polymer; (b) a preformed blend of a styrene/diene block copolymer and a hydrocarbon rubber extending oil; and (c) at least one blowing agent compound.
Claim 25
Dependent Claim
10 words
The foamed structure of claim 21, prepared by injection molding.
References Cited (Backward Citations)
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