US 7,985,780 B2Granted

Cylindrical mouldings based on cellular polyurethane elastomers

AssigneeBASF SE

InventorsElke Marten, Andreas Heidemann, Markus Schütte, Michael Strauβ, Heinrich Bollmann, Ralf Hansen

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Abstract

A cylindrical molding based on cellular polyurethane elastomers having a density according to DIN EN ISO 845 of from 300 to 900 kg/m3, a tensile strength according to DIN EN ISO 1798 of ≧2.0 N/mm2, an elongation at break according to DIN EN ISO 1798 of ≧200% and a tear propagation resistance according to DIN ISO 34-1 B (b), of ≧8 N/mm, wherein the cellular polyurethane elastomer is based on the reaction (i) of a prepolymer having isocyanate groups and based on (a) methylenediphenyl diisocyanate (MDI) and (b1) polyetherdiol having a molecular weight of from 1500 g/mol to 3000 g/mol and based on propylene oxide and/or ethylene oxide, with (ii) a crosslinking component comprising (b2) polyetheralcohol having a nominal functionality with respect to isocyanates of from 2 to 3 and a molecular weight of from 1500 g/mol to 6000 g/mol and based on propylene oxide and/or ethylene oxide, (c2) diol having a molecular weight of from 62 g/mol to 499 g/mol, (d) water and (e) catalysts, the polyols (b) present in the cylindrical molding and comprising (b1) and (b2) having an average polyol molar mass of less than 3900 g/mol.

Claims10

Dependent claims

A cylindrical molding comprising a cellular polyurethane elastomer wherein said cellular polyurethane elastomer is the reaction product of

(i) a prepolymer having isocyanate groups and which is based on
(a) methylenediphenyl diisocyanate, and
(b1) polyetherdiol having a molecular weight of from 1500 g/mol to 3000 g/mol and which is based on propylene oxide and/or ethylene oxide;
with
(ii) a crosslinking component comprising
(b2) polyetheralcohol having a nominal functionality with respect to isocyanates of from 2 to 3 and a molecular weight of from 1500 g/mol to 6000 g/mol and which is based on propylene oxide and/or ethylene oxide,
(c2) diol having a molecular weight of from 62 g/mol to 499 g/mol,
(d) water, and
(e) catalysts;
wherein (b1) and (b2) have an average polyol molar mass of from 3000 g/mol to 3700 g/mol, said average polyol molar mass M(Polyol) being calculated according to the following formula:
M
_
⁡
(
Polyol
)
=
(
M
b
⁢
⁢
11
·
m
b
⁢
⁢
11
+
…
+
M
b
⁢
⁢
1
⁢
⁢
n
·
m
b
⁢
⁢
1
⁢
n
⁢
)
·
W
p
+
(
M
b
⁢
⁢
21
·
m
b
⁢
⁢
21
+
…
+
M
b
⁢
⁢
2
⁢
⁢
n
·
m
b
⁢
⁢
2
⁢
⁢
n
)
·
W
v
(
m
b
⁢
⁢
11
+
…
+
m
b
⁢
⁢
1
⁢
⁢
n
)
·
W
p
+
(
m
b
⁢
⁢
21
+
…
+
m
b
⁢
⁢
2
⁢
⁢
n
)
·
W
v
wherein
M(Polyol) is average polyol molar mass in g/mol
Mb11 (or Mb1n) is molar mass of polyol b11 (or polyol b1n) in the prepolymer (i) in g/mol
Mb11 (or Mb1n) is mass fraction of polyol b11 (or polyol b1n) in the prepolymer (i) in g/g
WP:
is mass fraction of the prepolymer (i) in the cylindrical molding in g/g
Mb21 (or Mb2n):
is molar mass of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/mol
mb21 (or mb2n):
is mass fraction of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/g
WV:
is mass fraction of the crosslinking component (ii) in the cylindrical molding in g/g
wherein said cellular polyurethane elastomers have a density, according to DIN EN ISO 845, of from 300 to 900 kg/m3;
a tensile strength, according to DIN EN ISO 1798, of greater than or equal to 2.0 N/mm2;
an elongation at break, according to DIN EN ISO 1798, of greater than or equal to 200%;
and a tear propagation resistance, according to DIN ISO 34-1 B (b), of greater than or equal to 8 N/mm.

146 more elements

A process for producing cylindrical moldings comprising a cellular polyurethane elastomer comprising reacting

(i) a prepolymer having isocyanate groups and which is based on
(a) methylenediphenyl diisocyanate, and
(b1) polyetherdiol having a molecular weight of from 1500 g/mol to 3000 g/mol and which is based on propylene oxide and/or ethylene oxide;
with
(ii) a crosslinking component comprising
(b2) polyetheralcohol having a nominal functionality with respect to isocyanates of from 2 to 3 and a molecular weight of from 1500 g/mol to 6000 g/mol and which is based on propylene oxide and/or ethylene oxide,
(c2) diol having a molecular weight of from 62 g/mol to 499 g/mol,
(d) water, and
(e) catalysts;
wherein (b1) and (b2) have an average polyol molar mass of from 3000 g/mol to 3700 g/mol, said average polyol molar mass M(Polyol) being calculated according to the following formula:
M
_
⁡
(
Polyol
)
=
(
M
b
⁢
⁢
11
·
m
b
⁢
⁢
11
+
…
+
M
b
⁢
⁢
1
⁢
⁢
n
·
m
b
⁢
⁢
1
⁢
n
⁢
)
·
W
p
+
(
M
b
⁢
⁢
21
·
m
b
⁢
⁢
21
+
…
+
M
b
⁢
⁢
2
⁢
⁢
n
·
m
b
⁢
⁢
2
⁢
⁢
n
)
·
W
v
(
m
b
⁢
⁢
11
+
…
+
m
b
⁢
⁢
1
⁢
⁢
n
)
·
W
p
+
(
m
b
⁢
⁢
21
+
…
+
m
b
⁢
⁢
2
⁢
⁢
n
)
·
W
v
wherein
M(Polyol) is average polyol molar mass in g/mol
Mb11 (or Mb1n) is molar mass of polyol b11 (or polyol b1n) in the prepolymer (i) in g/mol
mb11 (or mb1n) is mass fraction of polyol b11 (or polyol b1n) in the prepolymer (i) in g/g
WP:
is mass fraction of the prepolymer (i) in the cylindrical molding in g/g
Mb21 (or Mb2n):
is molar mass of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/mol
mb21 (or mb2n):
is mass fraction of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/g
WV:
is mass fraction of the crosslinking component (ii) in the cylindrical molding in g/g
wherein said cellular polyurethane elastomers have a density, according to DIN EN ISO 845, of from 300 to 900 kg/m3;
a tensile strength, according to DIN EN ISO 1798, of greater than or equal to 2.0 N/mm2;
an elongation at break, according to DIN EN ISO 1798, of greater than or equal to 200%;
and a tear propagation resistance, according to DIN ISO 34-1 B (b), of greater than or equal to 8 N/mm.

146 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/816,325Filed 21 Feb 2006
Priority: DE 10 2005 008 24222 Feb 2005
Published: US 2008/0164112 A110 Jul 2008
Granted: 26 Jul 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

F16F 1/3605
Made of rubber or other material having high internal friction, e.g. thermoplastic elastomers: characterised by their material
C08G 18/12
Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step: using…
C08G 18/6674
With compounds of group C08G18/32 or polyamines of C08G18/38: with compounds of group C08G18/3203
C08G 18/797
Characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates: containing…