US3882055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing foams from unsaturated polyesters
Assignee: Evonik Goldschmidt GmbH
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Filing: 1973-04-04
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Granted: 1975-05-06
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Expires: 1993-04-04
Abstract
Abstract A process of producing polyester foams on the basis of hardenable unsaturated polyesters in the presence of surface active foam stabilizers. The invention provides that a foam stabilizer is used which is a polyoxalkylene-polysiloxane mixed block polymer. The block polymer is characterized in that A. THE POLYOXYALKYLENE BLOCKS OF THE POLYMER HAVE AN AVERAGE MOLE WEIGHT OF ABOUT BETWEEN 500 TO 3000 AND ESSENTIALLY CONSIST OF 40 TO 100 PERCENT BY WEIGHT OF ETHYLENE OXIDE, THE REMAINDER BEING PROPYLENE OXIDE AND/OR HIGHER ALKYLENE OXIDES, WITH THE PROVISO THAT WHEN THE PROPORTION OF ETHYLENE OXIDE IS 40 - 60 PERCENT BY WEIGHT, THE MOLECULAR WEIGHT OF THE POLYOXYALKYLENE BLOCKS IS >2000, AND B. THE POLYSILOXANE BLOCKS OF THE POLYMER CONTAIN ON THE AVERAGE 3 TO 35 SILICON ATOMS OF WHICH 2 THROUGH 30 ARE PRESENT IN THE FORM OF DIMETHYLSILOXY GROUPS WHILE THE REMAINING SILICON ATOMS FORM TRIFUNCTIONAL SILOXY UNITS.
Inventors
- 👤 Goetz Koerner
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4244; C08G18/4247; C08G18/425; C08G77/00; C08G77/42; C08G77/46; C08J2367/00; C08J2367/06; C08J2483/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
IN A PROCESS OF PRODUCING POLYESTER FOAMS ON THE BASIS OF HARDENABLE UNSATURATED POLYESTERS IN THE PRESENCE OF SURFACE ACTIVE FOAM STABILIZERS, THE IMPROVEMENT WHICH COMPRISES USING AS FOAM STABILIZER A POLYOXYALKYLENE-POLYSILOXANE MIXED BLOCK POLYMER, SAID BLOCK POLYMER BEING CHARACTERIZED IN THAT A. THE POLYOXYALKYLENE BLOCKS OF THE POLYMER HAVE AN AVERAGE MOLE WEIGHT OF ABOUT BETWEEN 500 TO 3,000 AND ESSENTIALLY CONSIST OF 40 TO 100 PERCENT BY WEIGHT OF ETHYLENE OXIDE, THE REMAINDER BEING PROPYLENE OXIDE AND/OR HIGHER ALKYLENE OXIDES, WITH THE PROVISO THAT WHEN THE PROPORTION OF ETHYLENE OXIDE IS 40-60 PERCENT BY WEIGHT, THE MOLECULAR WEIGHT OF THE POLYOXYALKYLENE BLOCKS IS > 2000, AND B. THE POLYSILOXANE BLOCKS OF THE POLYMER CONTAIN ON THE AVERAGE 3 TO 35 SILICON ATOMS OF WHICH 2 THROUGH 30 ARE PRESENT IN THE FORM OF DIMETHYLSILOXY GROUPS WHILE THE REMAINING SILICON ATOMS FORM TRIFUNCTIONAL SILOXY UNITS.
Claim 2
Dependent Claim
146 words
IN A PROCESS OF PRODUCING POLYESTER FOAMS ON THE BASIS OF HARDENABLE UNSATURATED POLYESTERS IN THE PRESENCE OF SURFACE ACTIVE FOAM STABILIZERS, THE IMPROVEMENT WHICH COMPRISES USING AS FOAM STABILIZER A POLYOXYALKYLENE-POLYSILOXANE MIXED BLOCK POLYMER, SAID BLOCK POLYMER BEING CHARACTERIZED IN THAT A. THE POLYOXYALKYLENE BLOCKS OF THE POLYMER HAVE AN AVERAGE MOLE WEIGHT OF ABOUT BETWEEN 500 TO 3,000 AND ESSENTIALLY CONSIST OF 40 TO 100 PERCENT BY WEIGHT OF ETHYLENE OXIDE, THE REMAINDER BEING PROPYLENE OXIDE AND/OR HIGHER ALKYLENE OXIDES, WITH THE PROVISO THAT WHEN THE PROPORTION OF ETHYLENE OXIDE IS 40-60 PERCENT BY WEIGHT, THE MOLECULAR WEIGHT OF THE POLYOXYALKYLENE BLOCKS IS > 2000, AND B. THE POLYSILOXANE BLOCKS OF THE POLYMER CONTAIN ON THE AVERAGE 3 TO 35 SILICON ATOMS OF WHICH 2 THROUGH 30 ARE PRESENT IN THE FORM OF DIMETHYLSILOXY GROUPS WHILE THE REMAINING SILICON ATOMS FORM TRIFUNCTIONAL SILOXY UNITS.
Claim 3
Dependent Claim
16 words
The improvement of claim 1, wherein said trifunctional siloxy units are bonded to said polyoxyalkylene blocks.
Claim 4
Dependent Claim
21 words
The improvement of claim 1, wherein said polyoxyalkylene-polysiloxane mixed block polymers contain 1.5 to 5 polyoxyalkylene blocks in the average molecule.
Claim 5
Dependent Claim
19 words
The improvement of claim 1, wherein said polyoxyalkylene-polysiloxane mixed block polymers contain 1.5-3 polyoxyalkylene blocks in the average molecule.
Claim 6
Dependent Claim
31 words
The improvement as claimed in claim 1, wherein said polyoxyalkylene polysiloxane mixed block polymers have polysiloxane blocks whose molecular weights are in close proximity to a mean value of molecular weight.
Claim 7
Dependent Claim
27 words
The improvement as claimed in claim 1, wherein the polysiloxane blocks of said polyoxyalkylene-polysiloxane mixed block polymers are equilibrated prior to reaction with the polyoxyalkylene glycol derivatives.
Claim 8
Dependent Claim
17 words
the improvement as claimed in claim 1, wherein said polyoxyalkylene-polysiloxane mixed block polymer has the average formula
Claim 9
Dependent Claim
23 words
The improvement of claim 6, wherein, when M is oxygen, at the most 50 percent of the X groups are alkyl or trialKylsilyl.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |