US 2008/0164112 A1 · Cylindrical Mouldings Based On Cellular Polyurethane Elastomers

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, the 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 having the following meanings: M(Polyol): Average polyol molar mass in g/mol Mb11 (or Mb1n): Molar mass of polyol b11 (or polyol b1n) in the prepolymer (i) in g/mol mb11 (or mb1n): Mass fraction of polyol b11 (or polyol b1n) in the prepolymer (i) in g/g WP: Mass fraction of the prepolymer (i) in the cylindrical molding in g/g Mb21 (or Mb2n): Molar mass of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/mol mb21 (or mb2n): Mass fraction of polyol b21 (or polyol b2n) in the crosslinking component (ii) in g/g WV: Mass fraction of the crosslinking component (ii) in the cylindrical molding in g/g.

Claims11

Dependent claims

1-10. (canceled)

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.

Cylindrical Mouldings Based On Cellular Polyurethane Elastomers

Life of this patent

Cylindrical Mouldings Based On Cellular Polyurethane Elastomers

Life of this patent

Abstract

Claims11