Patent US4331776A successfully refreshed from Google Patents.
US4331776A
Expired / Lapsed
US
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Polyamide masterbatches
Assignee: Rhone Poulenc Industries SA
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Filing: 1981-05-20
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Granted: 1982-05-25
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Expires: 2001-05-20
Abstract
Abstract Masterbatches useful for lightweight polyamide molding or extrusion comprise polyamide, a pore-forming agent and a fusible binder that is compatible with the polyamide. Admixture of the masterbatch and granular polyamide polymer results in a polyamide composition which can be molded or extruded into a product having increased homogeneity and expansion uniformity.
Inventors
- 👤 Jean-Pierre Gazonnet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J2377/00; Y; Y10; Y10S; Y10S521/00; Y10S521/919
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
49 words
A masterbatch composition of matter comprising a plurality of granules of (i) a particulate polyamide intimately admixed with (ii) a pore-forming agent therefor, said particulate polyamide and said pore-forming agent admixture being coated with and agglomerated by (iii) a fused binder material which is compatible with said polyamide (ii).
Claim 2
Dependent Claim
49 words
A masterbatch composition of matter comprising a plurality of granules of (i) a particulate polyamide intimately admixed with (ii) a pore-forming agent therefor, said particulate polyamide and said pore-forming agent admixture being coated with and agglomerated by (iii) a fused binder material which is compatible with said polyamide (ii).
Claim 3
Dependent Claim
55 words
The composition of matter as defined in claim 1, comprising at least 40% by weight of the polyamide (i), up to 50% by weight of the pore-forming agent (ii), and from about 10 to 20% by weight of the binder (iii), said binder (iii) having a melting point of from about 70° to 100° C.
Claim 4
Dependent Claim
31 words
The composition of matter as defined by claim 1, said polyamide (i) being selected from the group consisting of polyhexamethylene adipamide, polycaprolactam, polyhexamethylene sebacamide, polyundecanamide, polylauryllactam, polyhexamethylene azelamide and polyhexamethylene dodecanediamide.
Claim 5
Dependent Claim
16 words
The composition of matter as defined in claim 3, wherein the binder (iii) is a polyester.
Claim 6
Dependent Claim
21 words
The molding powder comprising a granular polyamide resin in intimate admixture with the composition of matter as defined by claim 1.
Claim 7
Dependent Claim
21 words
The molding powder as defined by claim 5, comprising from about 0.05 to 5% by weight of said composition of matter.
Claim 8
Dependent Claim
15 words
The molding powder as defined in claim 6, comprising a reinforcing amount of glass fibers.
Claim 9
Dependent Claim
16 words
The composition of matter as defined by claim 4, wherein the fusible binder is poly(ethylene glycol)sebacate.
Claim 10
Dependent Claim
23 words
The molding powder as defined by claim 6, further comprising a member selected from the group consisting of a pigment and an adjuvant.
Claim 11
Dependent Claim
20 words
The molding powder as defined by claim 5, the granular polyamide resin and the polyamide (i) being the same polymer.
Claim 12
Dependent Claim
13 words
The molding powder as defined by claim 10, the polyamide being polyhexamethylene adipamide.
Claim 13
Dependent Claim
47 words
A process for the formulation of the composition of matter as defined by claim 1, comprising intimately dry admixing the components (i), (ii), and (iii) under conditions such that the temperature of the admixture exceeds the melting point of the binder (iii) and subsequently granulating the admixture.
Claim 14
Dependent Claim
12 words
The process as defined by claim 12, further comprising pelletizing said granules.
Claim 15
Dependent Claim
13 words
The composition of matter as defined by claim 2, in a pellet form.
Claim 16
Dependent Claim
13 words
A shaped article comprising the composition of matter as defined by claim 1.
Claim 17
Dependent Claim
15 words
A shaped article comprising the molding powder as defined by claims 5, 6 or 7.
Claim 18
Dependent Claim
50 words
A process for molding a shaped article wherein the masterbatch composition of matter of claim 1 is intimately admixed with granular polyamide resin so that said masterbatch comprises from about 0.05 to about 5% by weight of the total resulting composition, and then molding said composition into said shaped article.
References Cited (Backward Citations)
US4183822A
Cited
US4097425A
Cited
US4174432A
Cited
US4142029A
Cited
US4158724A
Cited
US4126590A
Cited
US4105601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |