Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
A low-foaming polyurethane elastomer which is formed from (A) a prepolymer obtained by the reaction between polytetramethylene ether glycol and diphenylmethane diisocyanate, having a NCO content of 3-22 % by weight, (B) a polyoxypropylenetriol having a number-average molecular weight of 400-5,000 and a short-chain diol having a molecular weight of 120 or less, and (C) a foaming agent selected from water and halogenated hydrocarbons, and which has an urea bond concentration of 5 x 10⁻⁴ mole/g or less and a bulk density of 0.4-1 g/cm³.
Claim 2
Dependent Claim
18 words
An elastomer according to Claim 1, wherein the polytetramethylene ether glycol has a number-average molecular weight of 500-4,000.
Claim 3
Dependent Claim
18 words
An elastomer according to Claim 1, wherein the polytetramethylene ether glycol has a number-average molecular weight of 1,000-2,000.
Claim 4
Dependent Claim
18 words
An elastomer according to Claim 1, wherein the prepolymer has a NCO content of 5-15 % by weight.
Claim 5
Dependent Claim
16 words
An elastomer according to Claim 1, wherein the polyoxypropylenetriol has a number-average molecular weight of 600-3,000.
Claim 6
Dependent Claim
15 words
An elastomer according to Claim 1, wherein the short-chain diol is ethylene glycol or 1,4-butanediol.
Claim 7
Dependent Claim
19 words
An elastomer according to Claim 1, wherein the equivalent ratio of the polyoxypropylenetriol/the short-chain diol is 1/30 to 2/1.
Claim 8
Dependent Claim
19 words
An elastomer according to Claim 7, wherein the equivalent ratio of the polyoxypropylenetriol/the short-chain diol is 1/20 to 1/2.
Claim 9
Dependent Claim
14 words
An elastomer according to Claim 1, which has a bulk density of 0.5-0.9 g/cm³.
Claim 10
Dependent Claim
14 words
An elastomer according to Claim 1, which has a tensile strength of 40-100 kg/cm².
Claim 11
Dependent Claim
14 words
An elastomer according to Claim 1, which has a tear strength of 30-60 kg/cm².
Claim 12
Dependent Claim
21 words
An elastomer according to Claim 1, which has a compression set (50 % compression, 70°C and 22 hours) of 0-10 %.
Claim 13
Dependent Claim
27 words
An elastomer according to Claim 1, which has a compression fatigue (50 x 50 x 10 mm, 0.9±0.6 ton, 10 Hz and 1,000,000 times) of 0-10 %.
Claim 14
Dependent Claim
26 words
An elastomer according to Claim 1, which has a dynamic spring constant (100 x 100 x 10 mm, 1.2±0.9 ton and 10 Hz) of 10-30 t/cm.
Claim 15
Dependent Claim
11 words
A vibration-damping material comprising the low-foaming polyurethane elastomer of Claim 1.
Claim 16
Dependent Claim
14 words
A grooveless flat low spring pad comprising the low-foaming polyurethane elastomer of Claim 1.
Claim 17
Dependent Claim
13 words
A pad for bridge tie, comprising the low-foaming polyurethane elastomer of Claim 1.
Claim 18
Dependent Claim
14 words
A vibration-damping material for railroad slab, comprising the low-damping polyurethane elastomer of Claim 1.