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US5086095A
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US
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Weather-resistant polyacetal resin compositions and molded articles thereof
Assignee: Polyplastics Co Ltd
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Filing: 1990-10-15
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Granted: 1992-02-04
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Expires: 2010-10-15
Abstract
Abstract Weather-resistant polyacetal resin compositions and molded articles formed of the same include a polyacetal base resin, and a weather-resistant effective amount of a weather stabilizing package comprised of (i) a weather stabilizer that is at least one selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates, oxalanilides and hindered amines (ii) a homopolymer or copolymer of acrylic or methacrylic acid, or ester derivatives thereof, and (iii) a fluororesin.
Inventors
- 👤 Toru Katsumata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:59
CPC Classifications
C; C08; C08L; C08L59/00; C08K; C08K5/00; C08L33/00; C08L33/04; C08L33/06; C08L27/00; C08L27/02; C08L27/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
A weather-resistance molded article formed of a polyacetal resin composition which comprises, based on the total weight of the compositions, a melt-blend of: (A) a polyacetal base resin; (B) between 0.01 to 5% by weight of a weather stabilizer which is at least one selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates, oxalanilides and hindered amines; (C) between 1 to 40% by weight of an acrylic resin which is at least one resin selected from the group consisting of methyl methacrylate homopolymers or methyl methacrylate copolymers mainly comprised of methyl methacrylate; and (D) a fluororesin which is one or more polymers selected from the group consisting of polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride tetrafluoroethylene/hexafluoropropylene copolymer and tetrafluoroethylene/ethylene copolymer, and wherein said fluororesin being present in an effective amount of between 1 to 20% by weight to enhance the acrylic resin's fluidity within said polyacetal base resin such that said acrylic resin is present in a localized region near a surface of the molded article, whereby weather-resistance of the molded article is improved.
Claim 2
Dependent Claim
174 words
A weather-resistance molded article formed of a polyacetal resin composition which comprises, based on the total weight of the compositions, a melt-blend of: (A) a polyacetal base resin; (B) between 0.01 to 5% by weight of a weather stabilizer which is at least one selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates, oxalanilides and hindered amines; (C) between 1 to 40% by weight of an acrylic resin which is at least one resin selected from the group consisting of methyl methacrylate homopolymers or methyl methacrylate copolymers mainly comprised of methyl methacrylate; and (D) a fluororesin which is one or more polymers selected from the group consisting of polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride tetrafluoroethylene/hexafluoropropylene copolymer and tetrafluoroethylene/ethylene copolymer, and wherein said fluororesin being present in an effective amount of between 1 to 20% by weight to enhance the acrylic resin's fluidity within said polyacetal base resin such that said acrylic resin is present in a localized region near a surface of the molded article, whereby weather-resistance of the molded article is improved.
Claim 3
Dependent Claim
37 words
A weather-resistant molded article according to claim 1, wherein the weather stabilizer is a combination of a hindered amine, and one or more compounds selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates and oxalanilides.
Claim 4
Dependent Claim
144 words
A weather-resistant polyacetal resin molding composition comprising a blend of a polyacetal base resin and weather-resistant effective amount of a weather stabilization package which includes, based upon the total weight of the composition: (i) between 0.01 to 5 wt. % of a weather stabilizer that is at least one selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates, oxalanilides and hindered amines; (ii) between 1 to 40 wt. % of an acrylic resin which is selected from homopolymers or copolymers of acrylic or methacrylic acid, or ester derivatives thereof; and (iii) a fluororesin which is present in an effective amount of between 1 to 20 wt. % to enhance the acrylic resin's fluidity within said polyacetal base resin such that the acrylic resin is present in a localized surface region of a molded article, whereby weather-resistance of the molded article is improved.
Claim 5
Dependent Claim
144 words
A weather-resistant polyacetal resin molding composition comprising a blend of a polyacetal base resin and weather-resistant effective amount of a weather stabilization package which includes, based upon the total weight of the composition: (i) between 0.01 to 5 wt. % of a weather stabilizer that is at least one selected from the group consisting of benzotriazoles, benzophenones, aromatic benzoates, cyanoacrylates, oxalanilides and hindered amines; (ii) between 1 to 40 wt. % of an acrylic resin which is selected from homopolymers or copolymers of acrylic or methacrylic acid, or ester derivatives thereof; and (iii) a fluororesin which is present in an effective amount of between 1 to 20 wt. % to enhance the acrylic resin's fluidity within said polyacetal base resin such that the acrylic resin is present in a localized surface region of a molded article, whereby weather-resistance of the molded article is improved.
Claim 6
Dependent Claim
41 words
A weather-resistant polyacetal resin composition as in claim 6, which further comprises at least one additive selected from the group consisting of lubricants, nucleating agents, release agents, antistatic agents, surfactants, impact modifiers, and inorganic or organic fibrous, powdery or platy fillers.
Claim 7
Dependent Claim
14 words
A weather-resistant polyacetal resin composition as in claim 3, which further includes a colorant.
Claim 8
Dependent Claim
15 words
A weather-resistant polyacetal resin composition as in claim 5, wherein said colorant is carbon black.
Claim 9
Dependent Claim
15 words
A molded article which consists essentially of the weather-resistant polyacetal resin composition of claim 3.
Claim 10
Dependent Claim
13 words
A weather-resistant molded article according to claim 1, which further includes a colorant.
Claim 11
Dependent Claim
14 words
A weather-resistant molded article according to claim 8, wherein the colorant is carbon black.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |