US4042540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of highly elastic soft polyurethane foams
Assignee: Evonik Operations GmbH
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Filing: 1975-08-26
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Granted: 1977-08-16
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Expires: 1995-08-26
Abstract
Abstract In the disclosed foaming process for manufacturing soft polyurethane foams on the basis of polyethers containing at least two hydroxy groups, the foaming is carried out in the presence of selected low-molecular weight, low-viscosity methylpolysiloxanes which do not cause disorders in the boundary regions of the foam or shrinkage.
Inventors
- 👤 Helmut Lammerting
- 👤 Rolf-Dieter Langenhagen
- 👤 Gerd Rossmy
- 👤 Peter Zaske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G77/00; C08G77/04; C08G77/045; C08J2375/00; C08J2375/04; C08J2375/08; C08J2483/00; Y; Y10; Y10S; Y10S521/00; Y10S521/904; Y10S521/914
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
In a process of producing cold cure soft polyurethane foams, wherein polyethers having at least two hydroxy groups per molecule, water and organic polyisocyanate are foamed in the presence of catalysts, the foaming system optionally comprising cross-linkers, blowing agents and/or other auxiliaries, the improvement which comprises adding to the foaming system organopolysiloxane of the formula I ##STR4## wherein
Claim 2
Dependent Claim
58 words
In a process of producing cold cure soft polyurethane foams, wherein polyethers having at least two hydroxy groups per molecule, water and organic polyisocyanate are foamed in the presence of catalysts, the foaming system optionally comprising cross-linkers, blowing agents and/or other auxiliaries, the improvement which comprises adding to the foaming system organopolysiloxane of the formula I ##STR4## wherein
Claim 3
Dependent Claim
134 words
R 1 represents the same of different unsubstituted or substituted hydrocarbon groups which are devoid of groups that have a tendency to enter addition reactions with isocyanate; R 2 has the same meaning as R 1 or is OR 3 , wherein R 3 represents alkyl, aryl, alkaryl or [C m H 2m O] p R 4 , R 4 being lower alkyl, m = 2 to 4 and p being selected such that the mole weight of the total R 3 group does not exceed 400; and n = 2-10 and wherein essentially none of the individual components of the mixtures possess a value of n>10, the amount of the compound of formula I being between about [0,003] 0.003 to 2% by weight calculated on the amount of polyether in the foaming system.
Claim 4
Dependent Claim
134 words
R 1 represents the same of different unsubstituted or substituted hydrocarbon groups which are devoid of groups that have a tendency to enter addition reactions with isocyanate; R 2 has the same meaning as R 1 or is OR 3 , wherein R 3 represents alkyl, aryl, alkaryl or [C m H 2m O] p R 4 , R 4 being lower alkyl, m = 2 to 4 and p being selected such that the mole weight of the total R 3 group does not exceed 400; and n = 2-10 and wherein essentially none of the individual components of the mixtures possess a value of n>10, the amount of the compound of formula I being between about [0,003] 0.003 to 2% by weight calculated on the amount of polyether in the foaming system.
Claim 5
Dependent Claim
19 words
The improvement of claim 1, wherein the hydrocarbon groups of R 1 are devoid of --OH, --SH and >NH.
Claim 6
Dependent Claim
24 words
The improvement of claim 1, wherein p is chosen such that the mole weight of the total R 3 group does not exceed 150.
Claim 7
Dependent Claim
29 words
The improvement of claim 1, wherein R 1 is methyl, R 2 = R 1 or alkoxy of 1 to 4 carbon atoms and n = 2 to 6.
Claim 8
Dependent Claim
16 words
The improvement of claim 1, wherein at least 90% of all R 1 groups are methyl.
Claim 9
Dependent Claim
12 words
The improvement of claim 1, wherein all R 1 groups are methyl.
Claim 10
Dependent Claim
33 words
The improvement of claim 1, wherein R 1 is selected from the group consisting of n-alkyl of 2-18 carbon atoms, iso-alkyl of 2-18 carbon atoms, phenyl, vinyl, halogenalkyl, acetoxypropyl, 2-cyanoethyl, 3-cyanopropyl and hydrogen.
Claim 11
Dependent Claim
14 words
The improvement of claim 7, wherein the halogenalkyl is bromomethyl, chloromethyl, 2-chloroethyl or 3-chloropropyl.
Claim 12
Dependent Claim
44 words
The improvement of claim 1, wherein one R 1 group per average molecule is represented by 0 1/2 , the saturation of the residual valence being effected by a corresponding valence of another molecule, the total number of Si-atoms per molecule not exceeding 12.
Claim 13
Dependent Claim
21 words
The improvement of claim 1, wherein R 2 = R 1 = CH 3 or lower alkoxy of 1-6 carbon atoms.
Claim 14
Dependent Claim
9 words
The improvement of claim 1, wherein n = 2-8.
Claim 15
Dependent Claim
17 words
The improvement of claim 1, wherein the compound of formula I comprises 6-8 silicon atoms per molecule.
Claim 16
Dependent Claim
16 words
The improvement of claim 9, wherein the total number of silicon atoms does not exceed 8.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |