Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-06-16
2000-02-29
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524494, C08K 534
Patent
active
060310324
DESCRIPTION:
BRIEF SUMMARY
Flame retardants for glass fiber-reinforced polyamide resin compositions are already known. Thus, for example, red phosphorus or halogen-containing flame retardants are employed on an industrial scale for flame resistant treatment of glass fiber-reinforced polyamide resin compositions.
However, these flame retardants have decisive disadvantages, since, for example, in the event of a fire the halogen-containing flame retardants release toxic and corrosive compounds, such as dioxins or hydrogen halides, especially during prolonged fires, and red phosphorus forms phosphine during processing and furthermore leads to end products which have an intense red to dark brown intrinsic color.
Suitable halogen-free flame retardants for polyamide resin compositions which are not glass fiber-reinforced, such as melamine cyanurate, in turn have the disadvantage that they do not achieve adequate flame retardancy in glass fiber-reinforced polyamide resin compositions. It was therefore necessary to discover flame retardants which also have the effect of adequate flame retardancy in glass fiber-reinforced polyamide resin compositions and release no corrosive and toxic compounds in the event of a fire.
The use of melamine phosphate and of condensed melamine phosphates, such as, for example, dimelamine pyrophosphate for rendering plastics other than polyamides flame retardant is already known from several literature sources. Thus, for example, U.S. Pat. No. 4,010,137 describes the use of these flame retardants in polyolefins and U.S. Pat. No. 3,915,777 describes the use for coatings. It is furthermore known from Chem. Abstr. Volume 89: 111478 that melamine phosphate, which can be converted into dimelamine pyrophosphate by splitting off water, can be employed as a flame retardant in a polyamide which comprises calcium silicate filler but is not glass fiber-reinforced. However, as comparison experiments have shown, the use of melamine phosphate and of condensed melamine phosphates, such as, for example, dimelamine pyrophosphate, in non-reinforced polyamides leads to completely unsatisfactory results in respect of flame resistance, since the desired burning class V-0 was not achieved.
Although melamine phosphate or melem phosphate and condensed melamine phosphates or melem phosphates, such as, for example, dimelamine pyrophosphate, do not give satisfactory results in flame resistant treatment of polyamide resin compositions which are not glass fiber-reinforced, it has now been found, unexpectedly, that polyamide resin compositions which comprise these compounds in combination with glass fibers have a very good flame resistance.
The present invention accordingly relates to a flame resistant, glass fiber-reinforced polyamide resin composition characterized in that it comprises 10 to 40% by weight of melamine- or melem-phosphoric acid reaction products or mixtures thereof as flame retardants and 10 to 60% by weight of glass fibers.
Polyamide resin compositions which have been given a flame resistant treatment according to the invention can be either homo- or copolyamide resin compositions.
Polyamides are obtained, for example, by polymerization of a lactam or an amino acid or by polycondensation of a diamine and a dicarboxylic acid. Examples of suitable polyamides are, for example, those which are obtained by polymerization of .epsilon.-caprolactam, aminocaproic acid, 7-aminoheptanoic acid, 11-aminoundecanoic acid, 9-aminononanoic acid and .alpha.-pyrrolidone or .alpha.-piperidone, or polymers which are obtained by polycondensation of a diamine, such as, for example, hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine and m-xylylenediamine, with a dicarboxylic acid, such as terephthalic acid, isophthalic acid, adipic acid, sebacic acid, a dibasic dodecanoic acid and glutaric acid, or by copolymerization thereof.
These are, for example, poly-.epsilon.-caprolactam (nylon 6), polyhexamethyleneadipic acid amide (nylon 6/6), polyhexamethyleneazelaic acid amide (nylon 6/9), polyhexamethylenesebacic ac
REFERENCES:
patent: 3915777 (1975-10-01), Kaplan
patent: 4010137 (1977-03-01), Brady
patent: 4314927 (1982-02-01), Theysohn et al.
patent: 4321189 (1982-03-01), Ohshita et al.
patent: 4360616 (1982-11-01), Papilagan
patent: 4528304 (1985-07-01), Yoshimura et al.
patent: 4789698 (1988-12-01), Bonten et al.
patent: 4963610 (1990-10-01), Schmid et al.
patent: 5145904 (1992-09-01), Muehlbach et al.
patent: 5225464 (1993-07-01), Hill
patent: 5332778 (1994-07-01), Pipper et al.
patent: 5475041 (1995-12-01), Weil et al.
patent: 5482985 (1996-01-01), Baierweck et al.
patent: 5618864 (1997-04-01), Court
patent: 5618865 (1997-04-01), Martens et al.
patent: 5674972 (1997-10-01), Wabeeke et al.
patent: 5708065 (1998-01-01), Martens et al.
patent: 5795931 (1998-08-01), Katayama et al.
patent: 5859099 (1999-01-01), Kasowski
Database WPI, abstract No. 73-07617u (Nov. 29, 1972).
CA 89 111 478u, 1978.
Horacek Heinrich
Prinz Christian
Reichenberger Rudolf
Ritzberger Klaus
DSM Melapur B.V.
Hoke Veronica P.
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