Patent US4701475A successfully refreshed from Google Patents.
US4701475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes reinforced with rigid rod micro fillers
Assignee: Dow Chemical Co
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Filing: 1986-06-25
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Granted: 1987-10-20
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Expires: 2006-06-25
Abstract
Abstract In one aspect, this invention is a polyurethane polymer having dispersed therein elongated particles of a high-melting, rigid polymer in an amount sufficient to measurably increase the tensile strength and/or elongation of the polyurethane relative to a like polyurethane which is prepared in the absence of said elongated particles. In another aspect, this invention is an active hydrogen-containing composition comprising at least one active hydrogen-containing compound having dispersed therein elongated particles of a high-melting rigid polymer in an amount which provides reinforcement to a polyurethane polymer prepared by reacting said active hydrogen-containing composition with a polyisocyanate.
Inventors
- 👤 Robert B. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/82; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0871; C08G18/0876; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
55 words
A polyurethane polymer having dispersed therein elongated particles of a high-melting, rigid polymer, said particles having an average length of less than about 10 microns, in an amount sufficient to measurably increase the tensile strength and/or elongation of the polyurethane relative to a like polyurethane which is prepared in the absence of said elongated particles.
Claim 2
Dependent Claim
55 words
A polyurethane polymer having dispersed therein elongated particles of a high-melting, rigid polymer, said particles having an average length of less than about 10 microns, in an amount sufficient to measurably increase the tensile strength and/or elongation of the polyurethane relative to a like polyurethane which is prepared in the absence of said elongated particles.
Claim 3
Dependent Claim
19 words
The polyurethane polymer of claim 1 wherein said rigid polymer has an aspect ratio of at least about 6.4.
Claim 4
Dependent Claim
22 words
The polyurethane polymer of claim 2 which contains about 1 to about 20 parts of rigid polymer per part of polyurethane polymer.
Claim 5
Dependent Claim
21 words
The polyurethane polymer of claim 3 wherein said rigid polymer comprises a polymer of an aromatic diamine and an aromatic diisocyanate.
Claim 6
Dependent Claim
19 words
The polyurethane polymer of claim 4 wherein said aromatic diamine comprises methylene dianiline and said aromatic diisocyanate comprises diphenylmethanediisocyanate.
Claim 7
Dependent Claim
11 words
The polyurethane polymer of claim 3 which is noncellular or microcellular.
Claim 8
Dependent Claim
9 words
The polyurethane polymer of claim 3 which is cellular.
Claim 9
Dependent Claim
52 words
An active hydrogen-containing composition comprising at least one active hydrogen-containing compound having dispersed therein elongated particles of a high-melting polymer, which particles have an average length of less than about 10 microns, in an amount which provides reinforcement to a polyurethane polymer prepared by reacting said active hydrogen-containing composition with a polyisocyanate.
Claim 10
Dependent Claim
52 words
An active hydrogen-containing composition comprising at least one active hydrogen-containing compound having dispersed therein elongated particles of a high-melting polymer, which particles have an average length of less than about 10 microns, in an amount which provides reinforcement to a polyurethane polymer prepared by reacting said active hydrogen-containing composition with a polyisocyanate.
Claim 11
Dependent Claim
18 words
The composition of claim 8 wherein said rigid polymer has an aspect ratio of at least about 6.4.
Claim 12
Dependent Claim
25 words
The composition of claim 9 which contains from about 1 to about 20 parts of rigid polymer per 100 parts of active hydrogen containing compound(s).
Claim 13
Dependent Claim
20 words
The composition of claim 10 wherein said rigid polymer is a polymer of an aromatic diisocyanate and an aromatic diamine.
Claim 14
Dependent Claim
18 words
The composition of claim 11 wherein said aromatic diisocyanate comprises diphenylmethanediisocyanate and said aromatic diamine comprises methylene dianiline.
Claim 15
Dependent Claim
34 words
The composition of claim 10 wherein said active hydrogen containing compound comprises a polyether polyol having an equivalent weight of about 500 to about 8000 and a functionality of about 2 to about 3.
Claim 16
Dependent Claim
21 words
The composition of claim 13 wherein said active hydrogen containing compound further comprises a relatively low equivalent weight diol or diamine.
Claim 17
Dependent Claim
28 words
The composition of claim 13 further comprising a blowing agent, a catalyst for the reaction of an active hydrogen containing compound with a polyisocyanate, and a silicone surfactant.
Claim 18
Dependent Claim
18 words
The polymer of claim 3 wherein said particles have an average length of less than about 2 microns.
Claim 19
Dependent Claim
18 words
The composition of claim 10 wherein said particles have an average length of less than about 2 microns.
References Cited (Backward Citations)
US4102831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |