Production of viscoelastic polyurethane systems using block polymers having bonded siloxane blocks as cell openers

Patent metadata

Field	Value
Publication number	US-10189965-B2
Application number	US-201514857399-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Sep 17, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The use of bonded siloxane block polymers of the general average formula (I) M a M 1 b D c D 1 d T e Q f G g as additive in the production of PUR foam using at least one polyol component and at least one isocyanate component, wherein the polyol component used has an average hydroxyl number, determined to DIN 53240-1:2012-07, of >56 to <450 mg KOH/g, preferably 57-300 mg KOH/g, and wherein the PUR foam is produced at an isocyanate index of 65 to 108, is described.

First claim

What is claimed as new is:

1. A method of producing a polyurethane foam, said method comprising:
foaming a mixture to provide said polyurethane foam, said mixture comprising at least one isocyanate component, at least one polyol component, a blowing agent component comprising water and optionally a physical blowing agent, a stabilizer, and an additive comprising siloxane block polymers of the average general formula (I):
M a M 1 b D c D 1 d T e Q f G g

with

G are radicals, same or different, selected from the group consisting of:
(O 1/2 n SiR m —CH 2 CHR 3 —R 2 —CHR 3 CH 2 —SiR m O 1/2 ) n ,

(0 1/2 ) n —SiR m —CH 2 CHR 3 —R 2 —CR 3 ═CH 2 , and

(O 1/2 n SiR m —CH 2 CHR 3 —R 2 —CR 3 ═CR 3 —CH 3 ,

a=1 to 8,
b=1 to 8,
c=3-450,
d=1-30,
e=0-20,
f=0-20,
g=0.15 to 2,
where a+b≥2, a+b+c+d+e+f+g=N, and N is ≥11 and ≤500, and b+d≥1,
R are radicals, same or different, having 1-16 carbon atoms or aryl radicals having 6-16 carbon atoms or H or —OR 3 ,
R 1 are polyether radicals having a formula (II)

wherein
R 4 are alkyl radicals, same or different, which have from 1 to 18 carbon atoms, and optionally have ether functions, or aryl radicals which have from 6-18 carbon atoms and optionally have ether functions, or H,
R 5 are radicals, same or different, wherein R 5 is selected from the group consisting of: R 3 , H, and —C(O)R 3 ,
h is from 2 to 18,
i is from 0 to 40,
j is from 1 to 40,
k is from 0 to 40,
l is from 0 to 30,
wherein i+j+k+l≥3,
R 2 are divalent organic radicals, same or different, which have 2-20 carbon atoms and are optionally interrupted by ether, ester or amide functions or (—SiR 2 O—) n groups and optionally bear OH functions,
R 3 are alkyl radicals, same or different, having 1-16 carbon atoms or aryl radicals having 6-16 carbon atoms or H,
n=independently 1 or 2,
m=independently 1 or 2,
m+n=3,
wherein said at least one polyol component has an average hydroxyl number, determined to DIN 53240-1:2012-07, of greater than 56 to less than 450 mg KOH/g, and wherein said polyurethane foam is produced at an isocyanate index of 65 to 108 and has an open cell structure,
wherein said bonded siloxane block copolymers of the average general formula (I) are present in an amount of from 0.001 to 10 parts by weight per 100 parts of said at least one polyol component, and
wherein said at least one polyol component is present in an amount from 25% to 80% by weight of said mixture, water is present in an amount from 1% to 5% by weight of said mixture, catalysts are present in an amount from 0.01% to 1% by weight of said mixture, said physical blowing agent is present in an amount from 0% to 50% by weight of said mixture, said stabilizer is present in an amount of up to 5% by weight of said mixture, said at least one isocyanate component is present in an amount from 20% to 60% by weight of said mixture, and said additive is present in an amount from 0.001% to 10% by weight of said mixture.

2. The method of claim 1 , wherein said polyurethane foam is a viscoelastic polyurethane foam.

3. The method of claim 1 , wherein each of said bonded siloxane block polymers of the average general formula (I) functions as a cell opener.

4. The method of claim 1 , wherein each of said bonded siloxane block polymers of the average general formula (I) is employed in the form of an additive composition comprising from 0% to 90% by weight of one or more solvents.

5. The method of claim 1 , wherein said mixture further comprises a reactive amine and/or amine having a molar mass greater than 100 g/mol as a catalyst.

6. The method of claim 1 , wherein said at least one isocyanate component comprises tolylene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), MDI-based isocyanates or mixtures thereof.

7. The method of claim 1 , wherein at least 5% by weight of the total weight of said bonded siloxane block copolymers of the average general formula (I) has a molar mass of greater than 50 000.

8. A composition suitable for production of polyurethane foam comprising: a polyol component comprising at least one polyol having a hydroxyl number greater than 100 mgKOH/g, a blowing agent component comprising water and optionally a physical blowing agent, an additive, an amine catalyst, wherein the polyol component has an average hydroxyl number, determined to DIN 53240-1:2012-07, of greater than 56 to less than 450 mg KOH/g, and said additive comprises bonded siloxane block polymers of the average general formula (I):
M a M 1 b D c D 1 d T e Q f G g
with

G are radicals, same or different, selected from the group consisting of:
(O 1/2 n SiR m —CH 2 CHR 3 —R 2 —CHR 3 CH 2 —SiR m O 1/2 ) n ,

(0 1/2 ) n —SiR m —CH 2 CHR 3 —R 2 —CR 3 ═CH 2 , and

(O 1/2 n SiR m —CH 2 CHR 3 —R 2 —CR 3 ═CR 3 —CH 3 ,

a=2.4 to 4.1,
b=2 to 8,
c=10 to 250,
d=1-30,
e=0-20,
f=0-20,
g=0.1-3,
where a+b≥2, a+b+c+d+e+f+g=N, and N is ≥11 and ≤500, and b+d≥1,
R are radicals, same or different, having 1-16 carbon atoms, or aryl radicals having 6-16 carbon atoms, or H, or —OR 3 ,
R 1 are polyether radicals having a formula (II)

wherein
R 4 are alkyl radicals, same or different, which have 1 to 18 carbon atoms, and optionally have ether functions, or aryl radicals which have 6-18 carbon atoms and optionally have ether functions, or H,
R 5 are radicals, same or different, wherein R 5 is selected from the group consisting of: R 3 , H, and —C(O)R 3 ,
h is from 2 to 18,
i is from 0 to 40,
j is from 1 to 40,
k is from 1 to 40,
l is from 0 to 30,
wherein i+j+k+1≥3,
R 2 are divalent organic radicals, same or different, which have 2-20 carbon atoms and are optionally interrupted by ether, ester or amide functions or (—SiR 2 O-) n groups and optionally bear OH functions,
R 3 are alkyl radicals, same or different, having 1-16 carbon atoms or aryl radicals having 6-16 carbon atoms or H,
n=independently 1 or 2,
m=independently 1 or 2,
m+n=3,
wherein said polyurethane foam is produced at an isocyanate index of 65 to 108 and has an open cell structure,
wherein said polyol component is present in an amount from 25% to 80% by total weight of said composition, water is present in an amount from 1% to 5% by total weight of said composition, said amine catalyst are present in an amount from 0.01% to 1% by total weight of said composition, wherein said physical blowing agent is present in an amount from 0% to 50% by total weight of said composition, a stabilizer is present in an amount of up to 5% by total weight of said composition, at least one isocyanate component is present in an amount from 20% to 60% by total weight of said composition, and said additive is present in an amount from 0.001% to 10% by total weight of said composition.

9. A composition suitable for production of polyurethane foam comprising: a polyol component

Assignees

• Evonik Degussa Gmbh

Inventors

• Krebs Michael
• Hubel Roland
• Ferenz Michael
• Wolf Marco
• Guenther Thomas

Classifications

• C08J2483/12

  containing polyether sequences · CPC title

• C08J2375/08

  from polyethers · CPC title

• C08J2205/06

  Flexible foams · CPC title

• C08J9/125 Primary

  Water, e.g. hydrated salts · CPC title

• C08J9/0042

  containing silicon · CPC title