US 12,649,846 B2Granted

Self-extinguishing resin molded body

AssigneesNovacel, Polyplastics Co., Ltd.

InventorsHiroshi Katayama, Fumitake Utsumi, Takuhiro Koketsu, Kota Fujiwara

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Abstract

Self-extinguishing resin molded body obtained from a resin composition containing a polyolefin resin, a phosphorus-based flame retardant, and a glass fiber. The self-extinguishing resin molded body contains from 15 to 30 mass % of the phosphorus-based flame retardant and from 5 to 50 mass % of the glass fiber, and satisfies the following: a thickness of the resin molded body is from 1.5 to 8.0 mm; the self-extinguishing resin molded body self-extinguishes within 2 minutes after the completion of a burning test; the self-extinguishing resin molded body does not have a hole after burning.

Claims5

Dependent claims

A self-extinguishing resin molded body obtained from a resin composition consisting essentially of a polyolefin resin (A), a phosphorus-based flame retardant (B) other than ammonium polyphosphate, a glass fiber (C), and a carbonization accelerator (D) selected from the group consisting of magnesium bicarbonate, zinc oxide, titanium oxide, magnesium oxide, and silicon oxide, wherein the molded body comprises from 15 to 30 mass % of the phosphorus-based flame retardant (B), from 5 to 50 mass % of the glass fiber (C), and from 0.3 to 5 mass % of the carbonization accelerator (D), the content ratio of component (D) in the total amount of component (C) and component (D) being from 2 to 13 mass %;

and the resin molded body satisfies (I) to (III):
(I) A thickness of the self-extinguishing resin molded body is from 2.0 to 6.0 mm;
(II) The self-extinguishing resin molded body self-extinguishes within two minutes after the completion of a burning test using burning test method E as described below;
(III) The self-extinguishing resin molded body does not have a hole after being subjected to a burning test using burning test method E as described below;
Burning test method E:
A plaque (150×150×2.0 mm) made of the molded body described above is used,
a 200 mm-long flame is applied from above the plaque directly onto the center of the plaque for 130 seconds, and
the distance from the flame contact position on the plaque to the burner mouth is 150 mm,
wherein the glass fiber (C) is in the form of a resin-impregnated long fiber bundle, which is a long glass fiber bundle having the polyolefin resin of component (A) applied in a molten state and being integrated before being cut to a length from 5 mm to 50 mm, the long glass fiber bundle being a fiber bundle in which the filaments of the glass fiber (C) are aligned in a lengthwise direction and bundled together, the glass fiber content in the resin-impregnated long fiber bundle being 20 to 65 mass %.

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Dependencies are inferred from the claim text.

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Abstract

and the resin molded body satisfies (I) to (III):
(I) A thickness of the self-extinguishing resin molded body is from 2.0 to 6.0 mm;
(II) The self-extinguishing resin molded body self-extinguishes within two minutes after the completion of a burning test using burning test method E as described below;
(III) The self-extinguishing resin molded body does not have a hole after being subjected to a burning test using burning test method E as described below;
Burning test method E:
A plaque (150×150×2.0 mm) made of the molded body described above is used,
a 200 mm-long flame is applied from above the plaque directly onto the center of the plaque for 130 seconds, and
the distance from the flame contact position on the plaque to the burner mouth is 150 mm,
wherein the glass fiber (C) is in the form of a resin-impregnated long fiber bundle, which is a long glass fiber bundle having the polyolefin resin of component (A) applied in a molten state and being integrated before being cut to a length from 5 mm to 50 mm, the long glass fiber bundle being a fiber bundle in which the filaments of the glass fiber (C) are aligned in a lengthwise direction and bundled together, the glass fiber content in the resin-impregnated long fiber bundle being 20 to 65 mass %.

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