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US4980386A
Expired / Lapsed
US
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Methods for the manufacture of energy-attenuating polyurethanes
Assignee: Polymer Dynamics Technology Inc
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Filing: 1989-04-28
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Granted: 1990-12-25
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Expires: 2009-04-28
Abstract
Abstract A method for the manufacture of shock attenuating, low rebound polyurethanes in which polyols are reacted with polyisocyanates having a functionality of at least 2.3 at an isocyanate index of from about 65 to about 90.
Inventors
- 👤 Wen-Yu Tiao
- 👤 Chin-Sheng Tiao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/14; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G2110/00; C08G2110/0083; C08G2350/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
32 words
A process for the manufacture of a non-liquid, energy-attenuating polyurethane having low elastic recovery and low rebound resiliency, resulting from the reaction of linear polyols with branched polyisocyanates under polyurethane forming conditions.
Claim 2
Dependent Claim
32 words
A process for the manufacture of a non-liquid, energy-attenuating polyurethane having low elastic recovery and low rebound resiliency, resulting from the reaction of linear polyols with branched polyisocyanates under polyurethane forming conditions.
Claim 3
Dependent Claim
43 words
The process according to claim 1 in which the polyurethane forming conditions include the use of a catalyst selected from the group consisting of aliphatic and aromatic tertiary amines, tertiary phosphines, strong bases, acidic metal salts of strong acids, and organo metallic compounds.
Claim 4
Dependent Claim
38 words
The process according to claim 1 wherein the polyol has a molecular weight of between 400 to about 2000, an equivalent weight of between 215 and 1000, and possesses 2 secondary hydroxyl groups and no primary hydroxyl groups.
Claim 5
Dependent Claim
16 words
The process according to claim 3 wherein the polyisocyanate has a functionality of at least 2.3.
Claim 6
Dependent Claim
17 words
The process according to claim 4 wherein the isocyanate index is from about 65 to about 90.
Claim 7
Dependent Claim
8 words
A polyurethane made in accordance with claim 5.
Claim 8
Dependent Claim
38 words
The polyurethane of claim 6 possessing a Shore "OO" hardness according to ASTM D-2240 of between 20 to about 90 Shore "OO" for unfoamed polyurethanes and between 25 Shore "OOO" to about 60 Shore "OO" for foamed polyurethanes.
Claim 9
Dependent Claim
41 words
The polyurethane of claim 6 possessing a ball rebound resilience according to ASTM D-2632 of between 1 to about 26% for unfoamed polyurethanes and a ball rebound resilience according to ASTM D-3574H of between 5 to about 15% for foamed polyurethanes.
Claim 10
Dependent Claim
9 words
An article fabricated from the polyurethane of claim 6.
Claim 11
Dependent Claim
13 words
The article of claim 9 in which the article is an energy-attenuation device.
Claim 12
Dependent Claim
14 words
The article of claim 10 in which the device is a body protecting device.
Claim 13
Dependent Claim
15 words
The article according to claim 11 in which the device is incorporated into a glove.
Claim 14
Dependent Claim
15 words
The article according to claim 11 in which the device is incorporated into a helmet.
Claim 15
Dependent Claim
15 words
The article according to claim 11 in which the device is incorporated into a shoe.
Claim 16
Dependent Claim
31 words
The process according to claim 5 containing at least one additive selected from the group consisting of filler, pigment, surfactant, plasticizer and where said polyurethane is a foam, a foam stabilizer.
Claim 17
Independent Claim
56 words
A method for the manufacture of a solid shock-attenuating polyurethane in which a polyol is reacted with a polyisocyanate under polyurethane forming conditions using known catalytic agents for the reaction, the improvement comprising the use of a polyisocyanate having a functionality of at least 2.3 at an isocyanate index of from about 65 to about 90.
Claim 18
Independent Claim
56 words
A method for the manufacture of a solid shock-attenuating polyurethane in which a polyol is reacted with a polyisocyanate under polyurethane forming conditions using known catalytic agents for the reaction, the improvement comprising the use of a polyisocyanate having a functionality of at least 2.3 at an isocyanate index of from about 65 to about 90.
Claim 19
Dependent Claim
34 words
A method according to claim 11 in which the polyol has a molecular weight of between about 400 and 2000, an equivalent weight of between about 215 and 1000, and 2 secondary hydroxyl groups.
Claim 20
Dependent Claim
11 words
A polyurethane made in accordance with the method of claim 16.
References Cited (Backward Citations)
US4722946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |