Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-10-22
2002-09-10
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...
C524S080000, C524S420000, C524S430000, C525S439000, C523S351000
Reexamination Certificate
active
06448308
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a flame retardant resin composition having a high degree of flame retardant property. More particularly the present invention relates to a non-halogenated flame retardant resin composition improved in working environment and safety, reducing the generation of phosphoric acid and excellent in electric characteristics.
BACKGROUND ART
The polyester such as a polybutylene terephthalate, etc., has excellent mechanical characteristics, heat resistance, chemical resistance, etc., and is widely used as molded articles for uses in an electric/electronic field, automobile field, etc.
For the molded articles used in these fields, the flame retardant properties are required in many cases. Nowadays, resin compositions using mainly a halogenated compound and an antimony compound as a flame retardant and a flame retardant assistant for imparting the flame retardant property thereto, are generally used.
However, since in the case of using a resin composition containing a halogenated flame retardant as a molded article constituting an electric appliance, sometimes a decomposition product thereof may corrode a metal part which is another element constituting the electric appliance, a non-halogenated flame retardant resin composition has been required. Also, since some halogenated flame retardants cause issues in environmental effects, the non-halogenated flame retardant resin composition is further required.
As the non-halogenated flame retardant, there are phosphorus compounds. As a representative organic phosphorus compound, a low molecular weight phosphate such as triphenylphosphate (TPP), has been frequently used so far. However, since the polyester such as the polybutylene terephthalate, requires a relatively high processing temperature, there were problems of a bleeding and insufficient heat resistance in the case of blending the low molecular weight phosphate.
In the Japanese unexamined patent publication 7-126498 (Unexamined publication on May 16, 1995, Applied on Nov. 8, 1993 as the Japanese patent application 5-278015), a non-halogenated flame retardant for the polyester resin obtained by melting for reacting a polyester-based resin, an epoxy compound having 2 or more epoxy groups in its molecule, a phenolic resin and/or one or more kinds of non-halogenated flame retardant compounds selected from phosphorus-, nitrogen- and boron-based compounds having a functional group capable of reacting with the epoxy group, was disclosed. And in the Japanese unexamined patent publication 7-278267 (Unexamined publication on Oct. 24, 1995, Applied on Apr. 7, 1994 as the Japanese patent application 6-69728), a flame retardant polyester-based resin composition obtained by blending 5 to 50 parts weight above non-halogenated flame retardant with 100 parts weight of a polyester, was disclosed. The above non-halogenated flame retardant is characterized in using an epoxy compound having 2 or more epoxy groups in molecule thereof.
In the Japanese unexamined patent publication 8-188717 (Unexamined publication on Jul. 23, 1996, Applied on Jan. 6, 1995 as the Japanese patent application 7-785), a flame retardant resin composition consisting of a thermoplastic resin such as a polystyrene and a polyester, a phosphorus compound such as a phosphate and a phosphite, and a phenolaralkyl resin such as a reaction product of a phenolic resin (for example; cresol) with an aralkylhalide (for example; &agr;,&agr;-dichloro-p-xylene), was disclosed.
In the Japanese unexamined patent publication 8-208884 (Unexamined publication on Aug. 13, 1996, Applied on Jan. 30, 1995 as the Japanese patent application 7-12825), a flame retardant resin composition consisting of a thermoplastic resin such as a polystyrene and a polyester, a phosphorus compound such as a phosphate and a phosphite, and a phenolic resin prepared from a phenol substituted at the ortho- or para-position, was disclosed.
While, red phosphorus among the phosphorus compounds, is known to exhibit an excellent flame retardant property even by adding a small amount. As the flame retardants using the red phosphorus, the following examples can be cited.
In the Journal of Flame Retardant Chemistry, volume 7, 69-76, 1980, it was disclosed that a polystyrene is made of flame retardant by red phosphorus and a phenolic resin.
In the Plastic Engineering, Nov., 29-31, 1993, it was disclosed that a polybutylene terephtahlate is made of flame retardant by red phosphorus and a phenolic resin.
In the Japanese patent publication 2-37370 (Unexamined patent publication 58-108248 on Jul. 28, 1983, Applied on Dec. 19, 1981 as the Japanese patent application 56-205812), a flame retardant polyester resin composition composed of a thermoplastic polyester having a softening point of 150° C. or higher such as a polyethylene terephthalate of 99 to 34 parts weight, red phosphorus coated with a thermosetting resin of 1 to 25 parts weight and a reinforcing filler of 10 to 55 parts weight, was disclosed.
A technology of adding a metal oxide for the purpose of inactivating red phosphorus, was disclosed in the Japanese unexamined patent publication 51-42746 (Unexamined publication on Apr. 12, 1976, Applied on Oct. 9, 1974 as the Japanese patent application 49-115670), the Japanese unexamined patent publication 51-150553 (Unexamined publication on Dec. 24, 1976, Applied on Jul. 9, 1976 as the Japanese patent application 51-67544), etc.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a non-halogenated flame retardant resin composition having a high flame retardant property, improved in working environment and safety, also reducing the generation of phosphoric acid which affects electric characteristics thereof and excellent in electric characteristics.
Another object of the present invention is to provide a resin composition for electric/electronic parts consisting of a non-halogenated resin composition having a high flame retardant property and excellent in electric characteristics, and also electric/electronic parts composed thereof.
Further objectives and advantages of the present invention will be clarified by the following explanation.
The present invention comprises the following constitution.
1. A flame retardant resin composition comprising (A) a thermoplastic aromatic polyester of 100 parts weight, (B) a coated red phosphorus powder composed of essentially spherical red phosphorus, having a cured resin coating, directly obtained by a conversion treatment method of yellow phosphorus, not requiring the pulverization and without having crushed surfaces of 1 to 15 parts weight and (C) an aromatic polyearbonate of 5 to 150 parts weight.
2. A flame retardant resin composition according to paragraph 1, wherein (D) at least one kind of a compound selected from a group consisting of titanium oxide, aluminum oxide and molybdenum sulfide is further contained in a range of 0.05 to 5 parts weight based on 100 parts weight of (A) the thermoplastic aromatic polyester.
3. A flame retardant resin composition according to paragraph 2, wherein a generated amount of phosphine after heating the composition at a temperature of 120° C. for 24 hours is not more than 5×10
−5
g based on 1 g of red phosphorus contained in the composition, and also the generated amount of phosphoric acid by maintaining the composition under a humid and heat condition at a temperature of 121° C., at a humidity of 100% RH and under a pressure of 2.1 atm., is not more than 3×10
−4
g based on 1 g of the red phosphorus contained in the composition.
4. A flame retardant resin composition according to paragraph 1, wherein an inorganic filler is further contained in a range of 5 to 150 parts weight based on 100 parts weight of (A) the thermoplastic aromatic polyester.
5. A flame retardant resin composition according to paragraph 1, wherein a fluorine resin is further contained in a range of 0.01 to 10 parts weight based on 100 parts weight of (A) the thermoplastic aromatic polyester.
6. A flame retardant resin composition according to para
Haruhara Jun
Hironaka Katsuhiko
Suzuki Mioko
Szekely Peter
Teijin Limited
LandOfFree
Fire-retardant resin compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fire-retardant resin compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fire-retardant resin compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2891416