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US6043306A
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Flame-retardant thermoplastic resin composition
Assignee: Kyowa Chemical Industry Co Ltd
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Filing: 1998-05-26
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Granted: 2000-03-28
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Expires: 2018-05-26
Abstract
Abstract Provided by the present invention are a flame-retardant thermoplastic resin composition which consists of (a) 100 parts by weight of a thermoplastic resin, (b) 5 to 60 parts by weight of a halogen-containing flame retardant, (c) 3 to 20 parts by weight of a flame-retardant aid, (d) 0.5 to 10 parts by weight of silicone and (e) 5 to 30 parts by weight of magnesium hydroxide particles, and which undergoes extinction without dripping so that highly reliable flame retardancy can be obtained, shows excellent mold releasability, and gives a molded article which hardly suffers deterioration in physical properties; and a molded article molded from the composition.
Inventors
- 👤 Takeshi Imahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:56
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; C08K3/24; C08L; C08L25/00; C08K2003/2217; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
100 words
A flame-retardant thermoplastic resin composition consisting essentially of (a) 100 parts by weight of a thermoplastic resin, (b) 5 to 60 parts by weight of a halogen-containing flame retardant, (c) 3 to 20 parts by weight of a flame-retardant aid, (d) 0.5 to 10 parts by weight of silicone and (e) 5 to 30 parts by weight of magnesium hydroxide particles, wherein said magnesium hydroxide particles (e) have a specific surface area, measured by a BET method, of 1 to 20 m 2 /g and an average secondary particle diameter, measured by a microtrack method, of 0.2 to 6.0 μm.
Claim 2
Dependent Claim
100 words
A flame-retardant thermoplastic resin composition consisting essentially of (a) 100 parts by weight of a thermoplastic resin, (b) 5 to 60 parts by weight of a halogen-containing flame retardant, (c) 3 to 20 parts by weight of a flame-retardant aid, (d) 0.5 to 10 parts by weight of silicone and (e) 5 to 30 parts by weight of magnesium hydroxide particles, wherein said magnesium hydroxide particles (e) have a specific surface area, measured by a BET method, of 1 to 20 m 2 /g and an average secondary particle diameter, measured by a microtrack method, of 0.2 to 6.0 μm.
Claim 3
Dependent Claim
52 words
The composition of claim 1, wherein the magnesium hydroxide particles (e) are surface-treated with at least one surface-treating agent selected from the group consisting of higher fatty acids, a titanate coupling agent, a silane coupling agent, an aluminate coupling agent, phosphate esters of polyhydric alcohols and fatty acids, and an anionic surfactant.
Claim 4
Dependent Claim
21 words
The composition of claim 1, wherein the thermoplastic resin (a) is a polystyrene resin, a polyolefin resin or a polyamide resin.
Claim 5
Dependent Claim
21 words
The composition of claim 1, wherein the halogen-containing flame retardant (b) has a decomposition initiation temperature of 230° C. or above.
Claim 6
Dependent Claim
26 words
The composition of claim 1, wherein the halogen-containing flame retardant (b) is a bromine-containing flame retardant having a bromine content of at least 50% by weight.
Claim 7
Dependent Claim
20 words
The composition of claim 1, wherein the flame-retardant aid (c) is antimony trioxide, antimony pentoxide, zinc stannate or zinc borate.
Claim 8
Dependent Claim
17 words
The composition of claim 1, wherein the silicone (d) is a silicone resin or a silicone grease.
Claim 9
Dependent Claim
33 words
The composition of claim 1, wherein the halogen-containing flame retardant (b) is contained in an amount of 10 to 50 parts by weight per 100 parts by weight of the thermoplastic resin (a).
Claim 10
Dependent Claim
32 words
The composition of claim 1, wherein the flame-retardant aid (c) is contained in an amount of 5 to 18 parts by weight per 100 parts by weight of the thermoplastic resin (a).
Claim 11
Dependent Claim
31 words
The composition of claim 1, wherein the silicone (d) is contained in an amount of 1 to 5 parts by weight per 100 parts by weight of the thermoplastic resin (a).
Claim 12
Dependent Claim
33 words
The composition of claim 1, wherein the magnesium hydroxide particles (e) are contained in an amount of 8 to 20 parts by weight per 100 parts by weight of the thermoplastic resin (a).
Claim 13
Dependent Claim
13 words
A molded article formed of the flame-retardant thermoplastic resin composition of claim 1.
Claim 14
Dependent Claim
20 words
The molded article of claim 12, which gives an evaluation of V-0 in a test according to the UL94VE method.
Claim 15
Dependent Claim
27 words
The molded article of claim 12, which gives an evaluation of K-0 in a test according to the Kyowa Chemical method, which is a modified UL94VE method.
Claim 16
Dependent Claim
117 words
A flame-retardant thermoplastic resin composition consisting essentially of (a) 100 parts by weight of a thermoplastic resin, (b) 10 to 50 parts by weight of a halogen-containing flame retardant, (c) 5 to 18 parts by weight of a flame-retardant aid, (d) 1 to 5 parts by weight of silicone and (e) 8 to 20 parts by weight of magnesium hydroxide particles, wherein the silicone (d) is selected from the group consisting of silicone resin and silicone grease, and wherein the magnesium hydroxide particles (e) have a specific surface area, measured by a BET method, of 1 to 20 m 2 /g and an average secondary particle diameter, measured by a microtrack method, of 0.2 to 6.0 μm.
Claim 17
Dependent Claim
117 words
A flame-retardant thermoplastic resin composition consisting essentially of (a) 100 parts by weight of a thermoplastic resin, (b) 10 to 50 parts by weight of a halogen-containing flame retardant, (c) 5 to 18 parts by weight of a flame-retardant aid, (d) 1 to 5 parts by weight of silicone and (e) 8 to 20 parts by weight of magnesium hydroxide particles, wherein the silicone (d) is selected from the group consisting of silicone resin and silicone grease, and wherein the magnesium hydroxide particles (e) have a specific surface area, measured by a BET method, of 1 to 20 m 2 /g and an average secondary particle diameter, measured by a microtrack method, of 0.2 to 6.0 μm.
Claim 18
Dependent Claim
21 words
The composition of claim 15, wherein the thermoplastic resin (a) is a polystyrene resin, a polyolefin resin or a polyamide resin.
Claim 19
Dependent Claim
26 words
The composition of claim 15, wherein the halogen-containing flame retardant (b) is a bromine-containing flame retardant having a bromine content of at least 50% by weight.
References Cited (Backward Citations)
US4373048A
Cited
GB2163167A
Cited
JPH0273838A
Cited
EP0536423A1
Cited
JPH07119324A
Cited
EP0763563A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |