US4871789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced polymer compositions having excellent distinctness of image
Assignee: Dow Chemical Co
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Filing: 1988-04-18
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Granted: 1989-10-03
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Expires: 2008-04-18
Abstract
Abstract Molded polyurethanes are filled with a particular filler mixture, including a certain wollastonite or talc as a supplementary filler, to provide a polymer composition having surprising good physical properites and excellent surface quality.
Inventors
- 👤 Eloy C. Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:49
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K7/00; C08K7/02; C08K7/04; C08K7/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
A filled polymer composition comprising a polyurethane and/or polyurea matrix having dispersed therein a filler mixture comprising (A) a reinforcing filler having particles of an average aspect ratio of at least 4 and an average particle length of at least about 20μ, except the average particle length is at least about 40μ when the reinforcing filler is wollastonite, said reinforcing filler being present in an amount which provides enhanced physical properties to the polymer composition, and (B) a supplementary filler comprising a wollastonite having an aspect ratio of 7 or less and a particle length of about 35μ or less or an inorganic compound other than wollastonite having an average aspect ratio of about 4 or less and a median particle size of about 10μ or less, and characterized in that the filled polymer composition exhibits a distinctness of image of at least 80 DOI units.
Claim 2
Dependent Claim
146 words
A filled polymer composition comprising a polyurethane and/or polyurea matrix having dispersed therein a filler mixture comprising (A) a reinforcing filler having particles of an average aspect ratio of at least 4 and an average particle length of at least about 20μ, except the average particle length is at least about 40μ when the reinforcing filler is wollastonite, said reinforcing filler being present in an amount which provides enhanced physical properties to the polymer composition, and (B) a supplementary filler comprising a wollastonite having an aspect ratio of 7 or less and a particle length of about 35μ or less or an inorganic compound other than wollastonite having an average aspect ratio of about 4 or less and a median particle size of about 10μ or less, and characterized in that the filled polymer composition exhibits a distinctness of image of at least 80 DOI units.
Claim 3
Dependent Claim
44 words
The polymer composition of claim 1 wherein the composition contains from about 5 to about 50 weight percent of said reinforcing filler, and about 1 to about 20 weight percent of said supplementary filler, based on the weight of the polyurethane and/or polyurea matrix.
Claim 4
Dependent Claim
78 words
The polymer composition of claim 2 wherein said reinforcing filler is selected from the group consisting of wollastonite having an average particle size of at least 40μ, milled glass, flake grass, fiber glass, and polymeric fibers, and said supplementary filler is wollastonite having an average aspect ratio of about 3 to about 6 or less and a particle length of about 10 to about 30μ, or talc having an average particle size from about 0.5 to about 2μ.
Claim 5
Dependent Claim
65 words
The polymer composition of claim 3 wherein said polyurethane and/or polyurea is a reaction product of precursor materials comprising an aromatic polyisocyanate, an aromatic diamine chain extender, and a relatively high equivalent weight isocyanate-reactive material which is a primary hydroxyl-, primary amine-or secondary amine-terminated polyether having an average functionality of about 1.8 to about 4 and an equivalent weight from about 1000 to about 2500.
Claim 6
Dependent Claim
27 words
The polymer composition of claim 4 wherein the reinforcing filler is wollastonite having an average particle size of at least 40μ and the supplementary filler is talc.
Claim 7
Dependent Claim
15 words
The polymer composition of claim 5 which has a density of at least 0.8 g/cc.
Claim 8
Dependent Claim
15 words
The polymer composition of claim 6 which is prepared in a reaction injection molding process.
Claim 9
Dependent Claim
28 words
The polymer composition of claim 7 wherein said relatively high equivalent weight isocyanate-reactive material comprises a mixture of a primary amine terminated polyether and a primary hydroxyl-terminated polyether.
Claim 10
Dependent Claim
34 words
The polymer composition of claim 7 wherein said relatively high equivalent weight isocyanate-reactive material comprises a polyether having at least about 50% of its active hydrogen-containing groups in the form of primary amine groups.
Claim 11
Dependent Claim
16 words
The polymer composition of claim 3 which exhibits a distinctness of image of at least 85.
Claim 12
Dependent Claim
16 words
The polymer composition of claim 3 which exhibits a distinctness of image of at least 88.
Claim 13
Dependent Claim
14 words
An exterior automobile body part prepared by molding the polymer composition of claim 4.
Claim 14
Dependent Claim
14 words
An exterior automobile body part prepared by molding the polymer composition of claim 4.
Claim 15
Dependent Claim
14 words
An exterior automobile body part prepared by molding the polymer composition of claim 8.
Claim 16
Dependent Claim
14 words
An exterior automobile body part prepared by molding the polymer composition of claim 9.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |