US4687786A
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US
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Process for the preparation of flexible polyurethane foams
Assignee: Evonik Operations GmbH
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Filing: 1986-02-27
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Granted: 1987-08-18
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Expires: 2006-02-27
Abstract
Abstract Process for the preparation of flexible polyurethane foams using polysiloxane-polyoxyalkylene block copolymers as stabilizers having the general formula: ##STR1## in which A represents A 1 and A 2 polyoxyalkylene blocks, as defined hereinafter, which are linked to silicon over carbon and which have the general formula --R 2 --O--(C x H 2x O--) y R 3 , R 2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms and R 3 , x and y are as defined hereinafter, B is a methyl radical, the A or R 1 radical, R 1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkaryl radical, n has a value of 30 to 200, m has a value of 3 to 20 when B is a methyl radical or corresponds to the R 1 radical, and a value of 1 to 18 when B corresponds to the A radical, o has a value of 0 to 40, n being not less than 5 m, and m and o being not greater than 1/3 n, with the proviso that (a) the A 1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is a hydrogen radical and the average molecular weight of the A 1 Blocks is from 2,500 to 4,500, (b) the A 2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical, and the average molecular weight of the A 2 blocks is from 800 to 2,400, and (c) the molar ratio of the A 1 blocks to the A 2 blocks is 20:80 to 60:40, and there is at least one A 1 and one A 2 block in the average molecule. The stabilizers are distinguished by exceptionally high stabilizing properties and, when used in flexible polyurethane foams, surprisingly form open cells in spite of the fact that they contain OH-terminated polyoxyalkylene blocks.
Inventors
- 👤 Hans-Joachim Kollmeier
- 👤 Rolf-Dieter Langenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:36
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: 23
Claim 1
Independent Claim
357 words
In a process for the preparation of flexible polyurethane foams by reacting at least difunctional polyisocyanates, polyols with at least two hydroxyl groups per molecule, the equivalent weight of which per hydroxyl group is about 700 to 1,500, in the presence of catalysts, blowing agents and foam stabilizers composed of polysiloxane-polyoxyalkylene block copolymers, the improvement which comprises the polysiloxane-polyoxyalkylene block copolymers having the formula: ##STR6## wherein A represents A 1 and A 2 polyoxyalkylene blocks which are linked to silicon over carbon and which have the formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R 2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms, B is a methyl radical, the A or the R 1 radical, R 1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkaryl radical, n has a value of from 30 to 200, m has a value of 3 to 20 when B is methyl or the R 1 radical, and a value of 1 to 18, if B corresponds to the A radical, o has a value of 0 to 40, wherein n is not less than 5 m, and o is not greater than 1/3 n, with the proviso that (a) the A 1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is a hydrogen radical and x and y are such that the average molecular weight of the A 1 blocks is from 2,500 to 4,500, (b) the A 2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical and x and y are such that the average molecular weight of the A 2 blocks is from 800 to 2,400, and (c) the molar ratio of the A 1 blocks to the A 2 blocks is 20:80 to 60:40, and there is at least one A 1 and one A 2 block in the average molecule.
Claim 2
Dependent Claim
357 words
In a process for the preparation of flexible polyurethane foams by reacting at least difunctional polyisocyanates, polyols with at least two hydroxyl groups per molecule, the equivalent weight of which per hydroxyl group is about 700 to 1,500, in the presence of catalysts, blowing agents and foam stabilizers composed of polysiloxane-polyoxyalkylene block copolymers, the improvement which comprises the polysiloxane-polyoxyalkylene block copolymers having the formula: ##STR6## wherein A represents A 1 and A 2 polyoxyalkylene blocks which are linked to silicon over carbon and which have the formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R 2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms, B is a methyl radical, the A or the R 1 radical, R 1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkaryl radical, n has a value of from 30 to 200, m has a value of 3 to 20 when B is methyl or the R 1 radical, and a value of 1 to 18, if B corresponds to the A radical, o has a value of 0 to 40, wherein n is not less than 5 m, and o is not greater than 1/3 n, with the proviso that (a) the A 1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is a hydrogen radical and x and y are such that the average molecular weight of the A 1 blocks is from 2,500 to 4,500, (b) the A 2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical and x and y are such that the average molecular weight of the A 2 blocks is from 800 to 2,400, and (c) the molar ratio of the A 1 blocks to the A 2 blocks is 20:80 to 60:40, and there is at least one A 1 and one A 2 block in the average molecule.
Claim 3
Dependent Claim
63 words
The process of claim 1 wherein for the polysiloxane-polyoxyalkylene block copolymers R 1 is a methyl radical, R 2 is a --CH 2 CH 2 CH 2 -radical, n is from 50 to 150, m is from 3 to 15, when B is a methyl radical and from 1 to 13 when B represents the A radical, and o is 0 to 20.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein R 3 is a branched alkyl.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein R 3 is methyl or butyl.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein R 3 is a radical of a lower molecular weight carboxylic acid.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein the carboxylic acid is acetic acid.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein R 1 is a linear alkyl radical or a substituted linear alkyl radical and o is greater than zero.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein R 1 is phenyl or substituted phenyl and o is greater than zero.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein R 1 is phenylethylene or substituted phenylethylene and o is greater than zero.
Claim 11
Dependent Claim
14 words
The process of claim 7 wherein the substituents are halogen atoms or pseudohalogen radicals.
Claim 12
Dependent Claim
14 words
The process of claim 8 wherein the substituents are halogen atoms or pseudohalogen radicals.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein the substituents are halogen atoms or pseudohalogen radicals.
Claim 14
Dependent Claim
14 words
The process of claim 7 wherein the substituents are chlorine atoms or cyano radicals.
Claim 15
Dependent Claim
14 words
The process of claim 9 wherein the substituents are chlorine atoms or cyano radicals.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein n is from 50 to 50.
Claim 17
Dependent Claim
20 words
The process of claim 1 wherein m is 3 to 15 and B is methyl or the R 1 radical.
Claim 18
Dependent Claim
17 words
The process of claim 1 wherein m is 1 to 18 and B is the A radical.
Claim 19
Dependent Claim
11 words
The process of claim 17 wherein m is 1 to 13.
Claim 20
Dependent Claim
11 words
The process of claim 1 wherein o is 0 to 20.
Claim 21
Dependent Claim
301 words
A stabilizer comprising polysiloxane-polyoxyalkylene block copolymers having the formula: ##STR7## wherein A represents A 1 and A 2 polyoxyalkylene blocks which are linked to silicon over carbon and which have the formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R 2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms, B is a methyl radical, the A or the R 1 radical, R 1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkyarlyl radical, n has a value of from 30 to 200, m has a value of 3 to 20 when B is methyl the R 1 radical, and a value of 1 to 18, if B corresponds to the A radical, o has a value of 0 to 40, wherein n is not less than 5 m, and 0 is not greater than 1/3 n, with the proviso that (a) the A 1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is a hydrogen radical and x and y are such that the average molecular weight of the A 1 blocks is from 2,500 to 4,500, (b) the A 2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical and x and y are such that the average molecular weight of the A 2 blocks is from 800 to 2,400, and (c) the molar ratio of the A 1 blocks to the A 2 blocks is 20:80 to 60:40, and there is at least one A 1 and one A 2 block in the average molecule.
Claim 22
Dependent Claim
301 words
A stabilizer comprising polysiloxane-polyoxyalkylene block copolymers having the formula: ##STR7## wherein A represents A 1 and A 2 polyoxyalkylene blocks which are linked to silicon over carbon and which have the formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R 2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms, B is a methyl radical, the A or the R 1 radical, R 1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkyarlyl radical, n has a value of from 30 to 200, m has a value of 3 to 20 when B is methyl the R 1 radical, and a value of 1 to 18, if B corresponds to the A radical, o has a value of 0 to 40, wherein n is not less than 5 m, and 0 is not greater than 1/3 n, with the proviso that (a) the A 1 blocks consist of 30 to 60 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is a hydrogen radical and x and y are such that the average molecular weight of the A 1 blocks is from 2,500 to 4,500, (b) the A 2 blocks consist of 30 to 80 weight percent of oxyethylene units, the remainder being oxypropylene units, the R 3 radical is an alkyl radical with 1 to 4 carbon atoms or an acyl radical and x and y are such that the average molecular weight of the A 2 blocks is from 800 to 2,400, and (c) the molar ratio of the A 1 blocks to the A 2 blocks is 20:80 to 60:40, and there is at least one A 1 and one A 2 block in the average molecule.
Claim 23
Dependent Claim
59 words
The stabilizer of claim 20 wherein R 1 is a methyl radical, R 2 is a --CH 2 CH 2 CH 2 - radical, n is from 50 to 150, m is from 3 to 15, when B is a methyl radical and from 1 to 13 when B represents the A radical, and o is 0 to 20.
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |