US4861819A
Expired / Lapsed
US
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Wiper blade compositions
Assignee: Ford Motor Co
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Filing: 1987-11-02
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Granted: 1989-08-29
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Expires: 2007-11-02
Abstract
Abstract This invention relates to an environmentally durable composition which has excellent low temperature dynamic properties. The composition comprises a substantially homogeneous mixture of 100 parts by weight elastomer having a fully saturated backbone, curing agent for the elastomer in amounts sufficient to crosslink the elastomer, reinforcing particulate filler, at least 20 parts by weight of an aliphatic oil and paraffinic oil and/or naphthenic oil. Inclusion of the naphthenic oil and/or paraffinic oil with the aliphatic oil improves the overall properties and processability of the elastomer composition. Particulate graphite may be incorporated into the composition to lower its friction.
Inventors
- 👤 Ares N. Theodore
- 👤 Paul C. Killgoar, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:18
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/01; C08K3/011; C08K3/06; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08L; C08L23/00; C08L23/02; C08L23/16; C08L7/00; C08L91/00; C08L2205/00; C08L2205/02; C08L2205/025; C08L2312/00; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
153 words
An improved elastomer composition comprising a substantially homogenous mixture of: (a) I00 parts by weight of elastomer having a fully saturated backbone; (b) curing agent for said elastomer in amount sufficient to crosslink said elastomer; (c) reinforcing particulate filler; (d) at least 20 parts by weight aliphatic oil having a number average molecular weight of between about 250 and about 1500, wherein at least 90% by weight of said aliphatic oil boils above about 200° C.; and (e) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between about 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 400 and about 1000 and a pour point between about 0° F. and about 10° F.; and (iii) mixtures of (i) and (ii).
Claim 2
Dependent Claim
153 words
An improved elastomer composition comprising a substantially homogenous mixture of: (a) I00 parts by weight of elastomer having a fully saturated backbone; (b) curing agent for said elastomer in amount sufficient to crosslink said elastomer; (c) reinforcing particulate filler; (d) at least 20 parts by weight aliphatic oil having a number average molecular weight of between about 250 and about 1500, wherein at least 90% by weight of said aliphatic oil boils above about 200° C.; and (e) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between about 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 400 and about 1000 and a pour point between about 0° F. and about 10° F.; and (iii) mixtures of (i) and (ii).
Claim 3
Dependent Claim
22 words
The elastomer composition according to claim 1, wherein greater than 98% by weight of said aliphatic oil boils above about 200° C.
Claim 4
Dependent Claim
38 words
The elastomer composition according to claim 1, wherein said aliphatic oil is included in said composition in an amount of between about 30 and about 90 parts by weight based on 100 parts by weight of said elastomer.
Claim 5
Dependent Claim
27 words
The elastomer composition according to claim 1, wherein said aliphatic oil has a number average molecular weight (M n ) of between about 350 and about 700.
Claim 6
Dependent Claim
31 words
The elastomer composition according to claim 1, wherein said aliphatic oil is selected from (i) synthetic paraffinic mineral oils, (ii) synthetic paraffinic mineral oil based engine oils, and (iii) blends thereof.
Claim 7
Dependent Claim
29 words
The elastomer composition according to claim 5, wherein said aliphatic oil is selected from synthetic hydrocarbon basestock lubricating oils and engine oils based on synthetic hydrocarbon basestock lubricating oils.
Claim 8
Dependent Claim
19 words
The elastomer composition according to claim 1, wherein said reinforcing particulate filler is selected from organic and inorganic particulate.
Claim 9
Dependent Claim
52 words
The elastomer composition according to claim 1, wherein said modifying oil is selected from the group consisting of: (i) between about 2 and about 40 parts by weight said naphthenic oil; and (ii) between about 3 and about 50 parts by weight said paraffinic oil; and (iii) mixtures of (i) and (ii).
Claim 10
Dependent Claim
20 words
An elastomer composition according to claim 1, wherein about 86% by weight said naphthenic oil boils above about 107° C.
Claim 11
Dependent Claim
20 words
An elastomer composition according to claim 1, wherein about 87% by weight of said paraffinic oil boils above 100° C.
Claim 12
Dependent Claim
17 words
The elastomer composition according to claim 1, further comprising at least 20 parts by weight particulate graphite.
Claim 13
Dependent Claim
11 words
Windshield wiper blades made from the elastomer composition of claim 11.
Claim 14
Dependent Claim
14 words
The elastomer composition according to claim 11, wherein said reinforcing particulate comprises carbon black.
Claim 15
Dependent Claim
22 words
The elastomer composition according to claim 13, wherein said composition comprises between about 15 and about 100 parts by weight carbon black.
Claim 16
Dependent Claim
18 words
The elastomer composition according to claim 11, wherein said elastomer having a fully saturated backbone comprises ethylene-propylene-diene rubber.
Claim 17
Dependent Claim
20 words
The elastomer composition according to claim 15, wherein said curing agent for said elastomer comprises an accelerated sulfur curing system.
Claim 18
Dependent Claim
24 words
The elastomer composition according to claim 15, wherein said composition comprising between about 20 and about 60 parts by weight of said aliphatic oil.
Claim 19
Dependent Claim
31 words
The elastomer composition according to claim 17, wherein said aliphatic oil is selected from (i) synthetic paraffinic mineral oils, (ii) synthetic paraffinic mineral oil based engine oils, and (iii) blends thereof.
Claim 20
Dependent Claim
171 words
An elastomer composition suitable for use as windshield wiper material, which composition comprises a substantially homogenous mixture thereof: (a) 100 parts by weight ethylene-propylene-diene elastomer; (b) curing agent for said elastomer; (c) between about 15 and 100 parts by weight carbon black; (d) between about 20 and about 200 parts by weight particulate graphite; (e) between about 20 and about 60 parts by weight aliphatic oil having a number average molecular weight (Mn) of between about 250 and about 1500, and wherein at least 90% by weight of said oil boils above about 200° C.; and (f) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 300 and about 1000 and a pour point between about 500 0° F. to 10° F.; and (iii) mixtures of (i) and (ii).
Claim 21
Dependent Claim
171 words
An elastomer composition suitable for use as windshield wiper material, which composition comprises a substantially homogenous mixture thereof: (a) 100 parts by weight ethylene-propylene-diene elastomer; (b) curing agent for said elastomer; (c) between about 15 and 100 parts by weight carbon black; (d) between about 20 and about 200 parts by weight particulate graphite; (e) between about 20 and about 60 parts by weight aliphatic oil having a number average molecular weight (Mn) of between about 250 and about 1500, and wherein at least 90% by weight of said oil boils above about 200° C.; and (f) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 300 and about 1000 and a pour point between about 500 0° F. to 10° F.; and (iii) mixtures of (i) and (ii).
Claim 22
Dependent Claim
10 words
Windshield wiper blades made from the composition of claim 19.
Claim 23
Independent Claim
195 words
A method for making windshield wiper blades, which method comprises: (A) forming a composition comprising a substantially homogeneous mixture of: (a) 100 parts by weight of elastomer having a fully saturated backbone; (b) curing agent for said elastomer in amount sufficient to crosslink said elastomer; (c) at least 25 parts by weight particulate graphite; (d) reinforcing particulate filler; (e) at least 20 parts by weight aliphatic oil having a number average molecular weight (M n ) of between about 250 and about 1500, wherein at least 90% by weight of said aliphatic oil boils above about 200° C.; and (f) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between about 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 400 and about 1000 and a pour point between about 0° F. and about about 10° F. (iii) mixtures of (i) and (ii); and (B) forming said composition into said windshield wiper blades; and (C) curing said composition of said windshield wiper blades.
Claim 24
Independent Claim
195 words
A method for making windshield wiper blades, which method comprises: (A) forming a composition comprising a substantially homogeneous mixture of: (a) 100 parts by weight of elastomer having a fully saturated backbone; (b) curing agent for said elastomer in amount sufficient to crosslink said elastomer; (c) at least 25 parts by weight particulate graphite; (d) reinforcing particulate filler; (e) at least 20 parts by weight aliphatic oil having a number average molecular weight (M n ) of between about 250 and about 1500, wherein at least 90% by weight of said aliphatic oil boils above about 200° C.; and (f) at least 2 parts by weight modifying oil selected from the group consisting of: (i) naphthenic oil having a number average molecular weight between about 300 and about 500 and a pour point between about -30° F. and about +25° F.; (ii) paraffinic oil having a number average molecular weight between about 400 and about 1000 and a pour point between about 0° F. and about about 10° F. (iii) mixtures of (i) and (ii); and (B) forming said composition into said windshield wiper blades; and (C) curing said composition of said windshield wiper blades.
Claim 25
Dependent Claim
10 words
Wiper blades made according to the method of claim 21.
References Cited (Backward Citations)
US4616060A
Cited
US4645791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |