Patent US4540768A successfully refreshed from Google Patents.
US4540768A
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US
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Rim elastomers made from terephthalate polyester polyol derived polymer polyols
Assignee: Huntsman Corp
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Filing: 1984-10-09
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Granted: 1985-09-10
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Expires: 2004-10-09
Abstract
Abstract Reaction injection molded elastomers made from polymer polyols derived by reacting a liquid terephthalic polyester polyol with an organic polyisocyanate in the presence of a polyether polyol solvent are described. The liquid terephthalic polyester polyol may be made by reacting residue or scrap polyethylene terephthalate (PET) with an oxyalkylene glycol. The oxyalkylene glycol is preferably either diethylene glycol alone or a mixture of diethylene glycol and at least one other oxyalkylene glycol. The liquid terephthalic polyester polyol is preferably distilled to remove ethylene glycol. RIM elastomers made from these polymer polyols have improved hot tear (green strength) and final tear properties than prior art elastomers.
Inventors
- 👤 George P. Speranza
- 👤 Michael Cuscurida
- 👤 Richard J. G. Dominguez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/46; C08G18/4615; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/0857; C08G18/4009; C08G18/4018; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08G18/65; C08G18/66; C08G18/6603; C08G2120/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
69 words
A reaction injection molded elastomer made by reacting in a closed mold ingredients comprising a polyol derived from recycled polyethylene terephthalate, an amine terminated chain extender and a polyisocyanate wherein the polyol derived from recycled polyethylene terephthalate is a polymer polyol made by reacting a. a liquid terephthalic polyester polyol derived from recycled polyethylene terephthalate, with b. an organic polyisocyanate in the presence of c. a polyether polyol solvent.
Claim 2
Dependent Claim
69 words
A reaction injection molded elastomer made by reacting in a closed mold ingredients comprising a polyol derived from recycled polyethylene terephthalate, an amine terminated chain extender and a polyisocyanate wherein the polyol derived from recycled polyethylene terephthalate is a polymer polyol made by reacting a. a liquid terephthalic polyester polyol derived from recycled polyethylene terephthalate, with b. an organic polyisocyanate in the presence of c. a polyether polyol solvent.
Claim 3
Dependent Claim
53 words
The elastomer of claim 1 in which the liquid terephthalic polyester polyol derived from recycled polyethylene terephthalate is produced by the process comprising a. reacting recycled polyethylene terephthalate with an oxyalkylene glycol and b. stripping ethylene glycol from the reaction to give a mixture of esters which is free from solids upon standing.
Claim 4
Dependent Claim
91 words
A reaction injection molded elastomer made by reacting in a closed mold ingredients comprising a polymer polyol, an amine terminated chain extender and a polyisocyanate where the polymer polyol is made by the process comprising reacting (a) a liquid terephthalic polyester polyol produced by the process comprising (1) reacting recycled polyethylene terephthalate with an oxyalkylene glycol and (2) stripping ethylene glycol from the reaction to give a mixture of esters which is free from solids upon standing, with (b) an organic polyisocyanate in the presence of (c) a polyether polyol solvent.
Claim 5
Dependent Claim
91 words
A reaction injection molded elastomer made by reacting in a closed mold ingredients comprising a polymer polyol, an amine terminated chain extender and a polyisocyanate where the polymer polyol is made by the process comprising reacting (a) a liquid terephthalic polyester polyol produced by the process comprising (1) reacting recycled polyethylene terephthalate with an oxyalkylene glycol and (2) stripping ethylene glycol from the reaction to give a mixture of esters which is free from solids upon standing, with (b) an organic polyisocyanate in the presence of (c) a polyether polyol solvent.
Claim 6
Dependent Claim
26 words
The elastomer of claim 3 in which the mole ratio of glycols to recycled polyethylene terephthalate in the liquid terephthalic polyester polyol is greater than 1.2:1.
Claim 7
Dependent Claim
41 words
The elastomer of claim 3 in which the oxyalkylene glycol, used in the liquid terephthalic polyester polyol, has the formula ##STR2## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 2 to 10.
Claim 8
Dependent Claim
23 words
The elastomer of claim 3 in which the oxyalkylene glycol is a mixture of diethylene glycol and at least one more oxyalkylene glycol.
Claim 9
Dependent Claim
45 words
The elastomer of claim 3 in which in the stripping step in the making of the liquid terephthalic polyester polyol, at least 5 wt.%, based on the reactants charged, is taken off as overhead and at least 25 wt.% of the overhead is ethylene glycol.
Claim 10
Dependent Claim
36 words
The elastomer of claim 3 in which the liquid terephthalic polyester polyol is made at a temperature in the range from about 190° to 280° C. and at a pressure between about 1 to 20 atmospheres.
Claim 11
Dependent Claim
21 words
The elastomer of claim 3 in which the liquid terephthalic polyester polyol has an average hydroxyl number between 200 and 500.
Claim 12
Dependent Claim
24 words
The elastomer of claim 3 in which the ratio of equivalents of liquid terephthalic polyester polyol to organic polyisocyanate ranges from 1:1 to 2:1.
Claim 13
Dependent Claim
34 words
The elastomer of claim 3 in which in the polymer polyol, the combined weight of the liquid terephthalic polyester polyol and organic polyisocyanate is about 5 to 25 wt.% of the polyether polyol solvent.
Claim 14
Dependent Claim
29 words
The elastomer of claim 3 in which organic polyisocyanate in the polymer polyol is selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate and methylene bis-cyclohexylisocyanate.
Claim 15
Dependent Claim
23 words
The elastomer of claim 3 in which the polyether polyol solvent has a molecular weight in the range of about 3,000 to 8,000.
Claim 16
Dependent Claim
32 words
The elastomer of claim 3 in which the polyether polyol solvent has a hydroxyl number in the range of about 20 to 60 and a hydroxyl functionality of about 2 to 4.
Claim 17
Dependent Claim
12 words
The elastomer of claim 3 in which the polyisocyanate is a quasi-prepolymer.
Claim 18
Independent Claim
92 words
A method of making a reaction injection molded elastomer comprising reacting in a closed mold a polymer polyol, an amine terminated chain extender and a polyisocyanate, where the polymer polyol is made by the process comprising reacting a. a liquid terephthalic polyester polyol produced by the process comprising (1) reacting recycled polyethylene terephthalate with an oxyalkylene glycol and (2) stripping ethylene glycol from the reaction to give a mixture of esters which is free from solids upon standing, with (b) an organic polyisocyanate in the presence of (c) a polyether polyol solvent.
Claim 19
Independent Claim
92 words
A method of making a reaction injection molded elastomer comprising reacting in a closed mold a polymer polyol, an amine terminated chain extender and a polyisocyanate, where the polymer polyol is made by the process comprising reacting a. a liquid terephthalic polyester polyol produced by the process comprising (1) reacting recycled polyethylene terephthalate with an oxyalkylene glycol and (2) stripping ethylene glycol from the reaction to give a mixture of esters which is free from solids upon standing, with (b) an organic polyisocyanate in the presence of (c) a polyether polyol solvent.
Claim 20
Dependent Claim
83 words
The method of claim 16 in which in making the liquid terephthalic polyester polyol, the oxyalkylene glycol consists of diethylene glycol and at least one more oxyalkylene glycol which has the formula ##STR3## where R is hydrogen or lower alkyl of 1 to 4 carbon atoms and n is from 2 to 10, and in the stripping step, at least 5 wt.%, based on the reactants charged, is taken off as overhead and at least 25 wt.% of the overhead is ethylene glycol.
Claim 21
Dependent Claim
45 words
The method of claim 16 in which in the making of the liquid terephthalic polyester polyol, the mole ratio of glycol to recycled polyethylene terephthalate is greater than 1.2:1 and the resultant liquid terephthalic polyester polyol has an average hydroxyl number between 200 and 500.
Claim 22
Dependent Claim
55 words
The method of claim 16 in which in the making of the polymer polyol, the ratio of equivalents of liquid terephthalic polyester polyol to organic polyisocyanate ranges from 1:1 to 2:1 and the combined weight of the liquid terephthalic polyester polyol and organic polyisocyanate is about 5 to 25 wt.% of the polyether polyol solvent.
Claim 23
Dependent Claim
50 words
The method of claim 16 in which in the making of the polymer polyol, the polyether polyol solvent has a molecular weight in the range of about 3,000 to 8,000, a hydroxyl number in the range of about 20 to 60 and a hydroxyl functionality of about 2 to 4.
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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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |