Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-06-12
2004-06-29
Szekely, Peter (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S101000, C524S138000, C524S387000, C524S394000, C524S416000, C524S432000, C524S433000, C524S436000, C524S437000, C524S424000
Reexamination Certificate
active
06756430
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a flame-retarding thermoplasitc resin composition and to formed articles of flame-retarding resin made therefrom.
BACKGROUND OF THE INVENTION
Resins used in the technical fields of household and office-automation electric apparatuses, automobile parts and so on require a flame-retarding ability for providing for fire accident.
In Japanese Patent Kokai Sho 60-36542 A (corresponding to British Patent No. 2,142,638 A1), a flame-retarding resin composition is disclosed in which ammonium polyphosphate and a polyhydric alcohol are compounded in combination in a plastic resin. However, the polyphosphate blended in the resin composition has insufficient heat resistance and the water-proof ability of the polyhydric alcohol is not satisfactory. Therefore, this resin composition has a problem that it reveals unsatisfactory heat resistance and suffers often from discoloration at higher temperatures causing deterioration of appearance of formed article made therefrom and it has also insufficient water-proof ability resulting sometimes in an inferior appearance of the formed article made therefrom at higher relative humidities due to occurrence of surface bleeding-out.
In Japanese Patent Application Kokai Hei 11-116744 A, a flame-retarding resin composition is disclosed, which is composed of a polyolefin resin, an amine salt of pyrophosphoric acid or a condensed phosphoric acid with an amine having one or more nitrogen atom and a hydroxyl group-containing compound. This flame-retarding resin composition has a problem that the heat resistance of the resin composition is insufficient.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a flame-retarding thermoplastic resin composition superior in the heat resistance and in the water-proof ability, in which a high flame-retarding ability of formed article made therefrom is attained without deteriorating its mechanical properties, even when relatively small amount of flame-retarding additive is incorporated. The flame-retarding resin composition according to the present invention should be capable of producing formed articles exhibiting better appearance without suffering from thermal discoloration and from occurrence of bleeding-out of the blend component, because of its excellent heat resistance and/or water-proof ability. Here, the formed article to be used as a constructional part of electric instrument or apparatus should be able to maintain its electric insulation even at higher temperatures under higher relative humidities and should not emit any noxious gas nor smoke without causing any attack onto metals of the forming and processing apparatuses, by excluding any halogen-containing blend component in the resin composition.
A second object of the present invention is to provide formed articles of flame-retarding resin made from the above-mentioned flame-retarding resin composition.
The present invention resides in the following flame-retarding thermoplastic resin composition and formed articles of flame-retarding resin:
(1) A flame-retarding thermoplastic resin composition comprising
(A) a component of thermoplastic resin,
(B) a component of nitrogen atom-containing phosphatic compound,
(C) a component of hydroxyl group-containing compound or partly esterified product thereof and
(D) a component of neutralizer for acids,
wherein the proportion of each component is such that the component (A) is in the range from 60 to 90 parts by weight, the sum of the components (B)+(C) is in the range from 10 to 40 parts by weight and the component (D) is in the range from 0.1 to 5 parts by weight, per 100 parts by weight of the total sum of (A)+(B)+(C), respectively, wherein the weight ratio of (B)/(C) amounts to at least 1.
(2) A flame-retarding thermoplastic resin composition comprising
(A) a component of thermoplastic resin,
(B) a component of nitrogen atom-containing phosphatic compound,
(C) a component of hydroxyl group-containing compound or partly esterified product thereof,
(D) a component of neutralizer for acids and
(E) a component of triazine derivative,
wherein the proportion of each component is such that the component (A) is in the range from 60 to 90 parts by weight, the sum of the components (B)+(C) is in the range from 10 to 40 parts by weight, the component (D) is in the range from 0.1 to 5 parts by weight and the component (E) is in the range from 0 to 5 parts by weight, per 100 parts by weight of the total sum of (A)+(B)+(C), respectively, wherein the weight ratio of (B)/(C) amounts to at least 1.
(3) A flame-retarding thermoplastic resin composition comprising
(A) a component of thermoplastic resin,
(B) a component of nitrogen atom-containing phosphatic compound,
(C) a component of hydroxyl group-containing compound or partly esterified product thereof,
(D) a component of neutralizer for acids and
(F) a component of metal alkoxide,
wherein the proportion of each component is such that the component (A) is in the range from 60 to 90 parts by weight, the sum of the components (B)+(C) is in the range from 10 to 40 parts by weight, the component (D) is in the range from 0.1 to 5 parts by weight and the component (F) is in the range from 0.01 to 5 parts by weight, per 100 parts by weight of the total sum of (A)+(B)+(C), respectively, wherein the weight ratio of (B)/(C) amounts to at least 1.
(4) The flame-retarding thermoplastic resin composition as defined in any one of the above (1) to (3), wherein the thermoplastic resin of the component (A) comprises polyolefin resins, polystyrene resin, polyamide resins, polyester resins, polycarbonate resins, polyphenylene ether resins and modified polyphenylene ether resins.
(5) The flame-retarding thermoplastic resin composition as defined in the above (4), wherein the polyolefin resin comprises a polyethylene resin, polypropylene resin, poly-1-butene resin and poly-4-methyl-1-pentene resin.
(6) The flame-retarding thermoplastic resin composition as defined in any one of the above (1) to (5), wherein the nitrogen atom-containing phosphatic compound of the component (B) comprises a melamine pyrophosphate, ammonium polyphosphate and melamine polyphosphate.
(7) The flame-retarding thermoplastic resin composition as defined in any one of the above (1) to (6), wherein the hydroxyl group-containing compound or the partly esterified product thereof of the component (C) comprises pentaerythritol, dipentaerythritol, a partly esterified pentaerythritol and a partly esterified dipentaerythritol.
(8) The flame-retarding thermoplastic resin composition as defined in any one of the above (1) to (7), wherein the neutralizer for acids of component (D) comprises hydrotalcite, metal basic oxides and metal basic hydroxides.
(9) The flame-retarding thermoplastic resin composition as defined in any one of the above (2) and (4) to (8), wherein the triazine derivative of the component (E) comprises melamine and melamine cyanurate.
(10) The flame-retarding thermoplastic resin composition as defined in any one of the ab 3 to 9, wherein the metal alkoxide of the component (F) comprises titaninium alkoxides.
(11) A formed article of flame-retarding resin obtained by subjecting the flame-retarding thermoplastic resin composition as defined in any one of the above (1) to (10) to a forming process.
DETAILED DESCRIPTION OF THE INVENTION
As the thermoplastic resin to be used for the component (A) according to the present invention, any of known ones can be used without any restriction. Concrete examples therefor include polyolefin resins, polysrtyrene resin, polyamide resins, polyester resins, polycarbonate resins, polyphenylene ether resins, modified polyphenylene ether resins, ABS resin and polyoxymethylene resins. Among them, preference is given to polyolefin resins.
As the polyolefin resin to be used for the component (A) according to the present invention, there may be used, for example, homopolymers and copolymers of olefins as well as coplymers of olefins with small proportion of comonomers other
Hashimoto Mikio
Matsuda Yuichi
Sakai Ikunori
Mitsui Chemicals Inc.
Szekely Peter
LandOfFree
Flame-retarding thermoplastic resin composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flame-retarding thermoplastic resin composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flame-retarding thermoplastic resin composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3338772