US3607796A
Expired / Lapsed
US
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Foam-forming polypropylene composition
Assignee: Saint Gobain Isover G+H AG
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Filing: 1969-01-24
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Granted: 1971-09-21
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Expires: 1989-01-24
Abstract
Abstract A foam-forming polypropylene composition comprising A. A MAJOR PROPORTION OF A STEREOREGULAR PROPYLENE POLYMER HAVING A RELATIVELY HIGH MOLECULAR WEIGHT, THE SAID MOLECULAR WEIGHT BEING TOO HIGH TO PERMIT FOAMING OF THE POLYMER BY MEANS OF A LOW-BOILING HYDROCARBON BLOWING AGENT; B. A MINOR PROPORTION OF A RELATIVELY LOW MOLECULAR WEIGHT HEPTANE-SOLUBLE PROPYLENE POLYMER; AND C. A BLOWING AGENT HAVING SUFFICIENT AFFINITY FOR THE LOW MOLECULAR WEIGHT POLYPROPYLENE TO BE ABSORBED THEREBY, THE SAID BLOWING AGENT BEING SUBSTANTIALLY HOMOGENEOUSLY DISTRIBUTED THROUGHOUT THE ENTIRE POLYMER MASS DUE TO THE SOLUBILITY OF THE LOW MOLECULAR WEIGHT POLYPROPYLENE IN THE HIGH MOLECULAR WEIGHT POLYPROPYLENE.
Inventors
- 👤 Hans Eberle
- 👤 Gerhard Wuttke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/16
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
10 words
The composition of claim 1, which is a homopropylene polymer.
Claim 2
Dependent Claim
19 words
The composition of claim 1, wherein the propylene polymer includes a copolymer of graft polymer with another polymerizable olefin.
Claim 3
Dependent Claim
20 words
The composition of claim 1, wherein the propylene polymer includes a copolymer or graft polymer with a vinyl derivative polymer.
Claim 4
Dependent Claim
18 words
The composition of claim 1, wherein the propylene polymer includes a mixture of polypropylene with another olefin polymer.
Claim 5
Dependent Claim
20 words
The composition of claim 1, wherein the propylene polymer includes a mixture of the polypropylene with a vinyl derivative polymer.
Claim 6
Dependent Claim
13 words
The composition of claim 1, wherein the polypropylene is a gas phase polymerizate.
Claim 7
Dependent Claim
12 words
The composition of claim 1 wherein the polypropylene contains residual polymerization catalyst.
Claim 8
Dependent Claim
27 words
The composition of claim 1 wherein the polypropylene polymerizate is a gas phase polymerized copolymer or graft polymer of high molecular weight and low molecular weight polypropylene.
Claim 9
Dependent Claim
18 words
The composition of claim 1, wherein the polypropylene contains about 20% of polymer having an average below 230,000.
Claim 10
Dependent Claim
20 words
The composition of claim 1, wherein the low molecular weight polymerizate comprises about 10% by weight of the polymer mass.
Claim 11
Dependent Claim
20 words
The composition of claim 1, wherein the total polypropylene mass has an average molecular weight between 700,000 and 1,200, 000.
Claim 12
Dependent Claim
69 words
The composition of claim 1, which comprises between 5 and 35% by weight of polypropylene with a molecular weight below 230, 000; between 30 and 50% by weight of polypropylene with a molecular weight between 230,000 and 1,150,000; between 30 and 50% of polypropylene with a molecular weight above 1,150,000, the latter component including up to 5% of the total mass of polypropylene with a molecular weight above 3,000,000.
Claim 13
Dependent Claim
50 words
The composition of claim 12, wherein the polypropylene with a molecular weight below 230,000 comprises about 20%, the polypropylene with a molecular weight between 230,000 and 1,150, 000 comprises aboUt 40% and the polypropylene with a molecular weight above 1,150,000 comprises about 40% by weight of the total polypropylene mass.
Claim 14
Dependent Claim
26 words
The composition of claim 1, wherein the low molecular weight propylene of a molecular weight between 10,000 and 100,000 is constituted by isotactic and atactic polypropylene.
Claim 15
Dependent Claim
19 words
The composition of claim 15, wherein the said isotactic and atactic polypropylene comprises about 10% of the total mass.
Claim 16
Dependent Claim
45 words
The composition of claim 1, which has the following specifications of the propylene at (a) and (b) a. Numerical mean of the molecular weight: Mn calculated as 125,000 b. Weight mean of the molecular weight: Mw calculated as 1,151,000 c. Molecular weight distribution: (Mw/Mn-1) 8.2.
Claim 17
Dependent Claim
18 words
The composition of claim 1, wherein the propylene polymerizate has an isotactic index of about 65 to 95%.
Claim 18
Dependent Claim
25 words
The composition of claim 1, wherein the blowing agent is a low boiling point hydrocarbon having between five and ten carbon atoms in the molecule.
Claim 19
Dependent Claim
25 words
The composition of claim 1, wherein the blowing agent essentially consists of a gasoline fraction having a boiling point range between 60 and 95* C.
Claim 20
Dependent Claim
13 words
The composition of claim 1, which includes a cross-linking agent for the polypropylene.
Claim 21
Dependent Claim
68 words
A process of making a foam material of a fine cell structure comprising applying a hydrocarbon blowing agent in the form of a low boiling hydrocarbon to a powdered mass of a high molecular weight and low molecular weight polypropylene polymer composed as defined in claim 1 at (a) and thereafter blowing the mass into a foam by subjecting it to extrusion or injection at an elevated temperature.
Claim 22
Dependent Claim
21 words
The process of claim 22, wherein a nucleating agent for the foam cells and a stabilizer are added to the composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |