US3723491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxane-polyalkyleneglycol block copolymers suitable as foam stabilizers in the manufacture of polyurethane foams
Assignee: Evonik Operations GmbH
•
Filing: 1971-01-25
•
Granted: 1973-03-27
•
Expires: 1991-01-25
Abstract
Abstract Novel polysiloxane-polyalkyleneglycol block copolymers suitable as foam stabilizers in the preparation of flexible polyurethane foams. The novel block copolymers are characterized by the formula A B y, wherein
Inventors
- 👤 G Rossmy
- 👤 G Koerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G77/00; C08G77/42; C08G77/46; C08J2375/00; C08J2375/04; C08J2483/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
13 words
A block copolymer as claimed in claim 1, wherein y 2 to 3.5.
Claim 2
Dependent Claim
25 words
A block copolymer as claimed in claim 1, wherein the remaining 10 mole percent of said alkyl groups of A are ethyl, propyl or isobutyl.
Claim 3
Dependent Claim
27 words
A block copolymer as claimed in claim 1, wherein the polysiloxane moiety A is essentially composed of structural units of the formula (R2SiO) wherein R symbolizes alkyl.
Claim 4
Dependent Claim
23 words
A block copolymer as claimed in claim 1, wherein the molecular weight of the polysiloxane moiety A is between about 600 to 3,250.
Claim 5
Dependent Claim
19 words
A block copolymer as claimed in claim 1, wherein the alkyl group of the polyalkyleneglycol monoalkylether moiety is n-butyl.
Claim 6
Dependent Claim
22 words
A block copolymer as claimed in claim 1, wherein the aryl group of the polyalkyleneglycol monoarylether moiety is phenyl or substituted phenyl.
Claim 7
Dependent Claim
15 words
A block copolymer as claimed in claim 1, wherein the alkyleneoxy groups of B are
Claim 8
Dependent Claim
13 words
A block copolymer as claimed in claim 1, which corresponds to the formula
Claim 9
Dependent Claim
13 words
A block copolymer as claimed in claim 1, which corresponds to the formula
Claim 10
Dependent Claim
13 words
A block copolymer as claimed in claim 1, which corresponds to the formula
Claim 11
Dependent Claim
35 words
A block copolymer as claimed in claim 1, wherein alkoxy groups are contained in said polysiloxane moiety, the amount of said alkoxy groups being at the most 10 mole percent calculated on the alkyl groups.
Claim 12
Dependent Claim
20 words
A block copolymer as claimed in claim 12, wherein said alkoxy groups of A are derived from a secondary alcohol.
Claim 13
Dependent Claim
19 words
A block copolymer as claimed in claim 13, wherein said secondary alcohol is isopropyl alcohol or secondary butyl alcohol.
Claim 14
Dependent Claim
14 words
A block copolymer as claimed in claim 13, wherein said alkoxy groups are chlorinated.
References Cited (Backward Citations)
US3182076A
Cited
US3420782A
Cited
US3168543A
Cited
US3272762A
Cited
US3402192A
Cited
US3457173A
Cited
US3299113A
Cited
US3271331A
Cited
US3342766A
Cited
US3280160A
Cited
US3341338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |