Patent US4062819A successfully refreshed from Google Patents.
US4062819A
Expired / Lapsed
US
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Polyamide blends having improved processing characteristics
Assignee: Union Camp Corp
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Filing: 1976-09-07
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Granted: 1977-12-13
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Expires: 1996-09-07
Abstract
Abstract The flow characteristics and rheological properties of high molecular weight thermoplastic polyamides are significantly improved by blending therewith a small amount of a polyamide derived from high molecular weight dibasic acids. In addition to improving the processability of the thermoplastic resin, the blends and manufactured articles produced therefrom have other desirable properties.
Inventors
- 👤 Harold E. Mains
- 👤 Frederick R. Williams
- 👤 William L. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:02
CPC Classifications
C; C08; C08L; C08L77/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
108 words
A method for improving the flow characteristics and rheological properties of a nylon resin which comprises blending therewith from 0.01% to 20% by weight of a high molecular weight polyamide additive having an amine value less than 3 and obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid containing from 18 to 52 carbon atoms and up to 30 weight percent, based on total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
Claim 2
Independent Claim
108 words
A method for improving the flow characteristics and rheological properties of a nylon resin which comprises blending therewith from 0.01% to 20% by weight of a high molecular weight polyamide additive having an amine value less than 3 and obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid containing from 18 to 52 carbon atoms and up to 30 weight percent, based on total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
Claim 3
Dependent Claim
32 words
The method of claim 1 where the polyamide additive has a number average molecular weight from about 5,000 to 50,000 and a softening point in the range 100° C to 240° C.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein the nylon resin is selected from the group consisting of nylon 4, nylon 6, nylon 6,6, nylon 6,9, nylon 6,10, nylon 6,12, nylon 9, nylon 11 and nylon 12.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the polyamide is derived from a high molecular weight dibasic acid containing 75% or more C 36 dimer acid obtained by the dimerization of C 18 unsaturated monocarboxylic acids.
Claim 6
Dependent Claim
37 words
The method of claim 4 wherein the high molecular weight dibasic acid has an acid value in the range 180 to 215, saponification value in the range 190 to 205 and neutral equivalent from 265 to 310.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein the high molecular weight dibasic acid is hydrogenated and contains 90% or more C 36 dimer acid.
Claim 8
Dependent Claim
70 words
The method of claim 4 wherein the short-chain, saturated, aliphatic dibasic acid contains from 6 to 13 carbon atoms and constitutes from 1 to 20 weight percent of the total dibasic acid charge and the diamine is a mixture of two diamines, said diamines differing by at least three carbon atoms with the longer chain diamine constituting from about 5% to 35%, based on equivalents, of the total diamine charge.
Claim 9
Dependent Claim
38 words
The method of claim 7 wherein the polyamide additive has a number average molecular weight in the range 10,000 to 35,000, a softening point in the range 150° C to 210° C and amine value less than 1.
Claim 10
Dependent Claim
35 words
The method of claim 8 wherein the nylon resin is selected from the group consisting of nylon 4, nylon 6, nylon 6,6, nylon 6,9, nylon 6,10, nylon 6,12, nylon 9, nylon 11 and nylon 12.
Claim 11
Dependent Claim
110 words
A thermoplastic polyamide resin blend having improved flow characteristics and rheological properties comprising 80% to 99.99% by weight of a nylon resin and 0.01% to 20% by weight of a polyamide additive having an amine value less than 3 and obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid having from 18 to 52 carbon atoms and up to 30 weight percent, based on the total dibasic acid charge, of a short-chain, saturated aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
Claim 12
Dependent Claim
110 words
A thermoplastic polyamide resin blend having improved flow characteristics and rheological properties comprising 80% to 99.99% by weight of a nylon resin and 0.01% to 20% by weight of a polyamide additive having an amine value less than 3 and obtained by the reaction of a high molecular weight aliphatic or cycloaliphatic dibasic acid having from 18 to 52 carbon atoms and up to 30 weight percent, based on the total dibasic acid charge, of a short-chain, saturated aliphatic dibasic acid having from 2 to 13 carbon atoms with a stoichiometric amount of an aliphatic, saturated diamine having from 2 to 10 carbon atoms or a mixture of said diamines.
Claim 13
Dependent Claim
62 words
The resin blend of claim 10 wherein the nylon is selected from the group consisting of nylon 4, nylon 6, nylon 6,6, nylon 6,9, nylon 6,10, nylon 6,12, nylon 9, nylon 11, and nylon 12 and the polyamide additive has a number average molecular weight from about 5,000 to 50,000 and a softening point in the range 100° C - 240° C.
Claim 14
Dependent Claim
97 words
The resin blend of claim 11 wherein the polyamide additive is derived from a high molecular weight dibasic acid containing 75% or more C 36 dimer acid obtained by the dimerization of C 18 unsaturated monocarboxylic acids, 1 to 20 weight percent, based on the total dibasic acid charge, of a short-chain, saturated, aliphatic dibasic acid having from 6 to 13 carbon atoms and a mixture of two diamines, said diamines differing by at least three carbon atoms with the longer chain diamine constituting from about 5% to 35%, based on equivalents, of the total diamine charge.
Claim 15
Dependent Claim
50 words
The resin blend of claim 12 wherein the polyamide additive comprises from 0.1% to 10% by weight of the blend and has a number average molecular weight in the range 10,000 to 35,000, a softening point in the range 150° C to 210° C and amine value less than 1.
Claim 16
Dependent Claim
52 words
The resin blend of claim 13 wherein the polyamide is derived from a high molecular weight dibasic acid having an acid value in the range 180 to 215, saponification in the range 190 to 205 and neutral equivalent from 265 to 310 and the diamine is a mixture of ethylenediamine and hexamethylenediamine.
Claim 17
Dependent Claim
24 words
The resin blend of claim 14 wherein the high molecular weight dibasic acid is hydrogenated and contains 90% or more C 36 dimer acid.
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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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |