Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-04-24
1999-05-18
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525190, 525191, 525217, 525219, 525222, 525227, 525238, 525240, 525242, 526336, 526341, 526346, C08L25/02;25/12;33/12
Patent
active
059051183
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to terpolymers of a vinyl aromatic monomer such as styrene, .alpha.-methylstyrene, chlorostyrene and the like; an unsaturated nitrile monomer such as acrylonitrile, methacrylonitrile and the like and a dialkylvinyl aromatic phosphonate and to miscible blends thereof with certain polymers such as poly(styrene acrylonitrile) polymers (SAN) and polymers and copolymers of methylmethacrylate.
FIELD OF THE INVENTION
Terpolymers of styrene (S), acrylonitrile (AN) and dimethylstyrene phosphonate (DMSP) and blends thereof with other polymers such as SAN and polymethylmethacrylate (PMMA).
DESCRIPTION OF RELATED ART
Polymers containing phosphonic acid groups are known in the art. Examples include styrene/1-phenylvinylphosphonic acid copolymers (Plast. Massy, No. 8 (1966)24), crosslinked vinyl phosphonate copolymers (U.S. Pat. No. 3,726,839), and styrenic polymers that contain pendent phosphonate ester
U.S. Pat. No. 5,237,028, 5,274,050 and 5,340,883 to S. H. Guo and R. A. Grey teach copolymers of a styrene monomer and 1-phenylvinyl phosphinic acid. These copolymers are reacted with a diamine or polyamine to form absorbents for organic liquids.
Phosphorus compounds have been used to impart flame retardance to a number of polymer systems (see Huggard, M. T. 1993, New Intumescent Phosphorus-Based Fire Retardants, Plastics Engineering, 49, 28). In mixtures of polymers such as ABS with main-chain aromatic polymer such as polycarbonate, phosphorous based compounds can impart flame retardance (see Witgosky, V. Flame Retardants, Plast. Eng. 49,10,21).
The incorporation of organophosphorus compounds, while minimizing some of the environmental concerns of halogens, can still result in performance changes due to plasticization and migration. Incorporation of bound phosphorous functional groups into the polymer structure opens up the possibility of new performance regimes.
SUMMARY OF THE INVENTION
Disclosed herein are novel styrenic compositions which contain phosphorous and which are miscible with polymers such as styrene acrylonitrile polymers (SAN) and polymers and copolymers of methylmethacrylate. The novel styrenic compositions comprise at least one vinyl aromatic monomer, at least one unsaturated nitrile monomer and a dialkylvinylaromatic phosphonate. The preferred vinylaromatic monomers are styrene, alphamethyl styrene, vinyl toluene, halostyrenes, e.g. bromo- or chloro-styrene, paramethyl styrene and the like. Most preferred are styrene and alphamethylstyrene. The preferred unsaturated nitrile monomers are acrylonitrile and methacrylonitrile with acrylonitrile being more preferred. The foregoing monomers may also be used to prepare variations of the SAN used in the miscible blends with the phosphorous containing polymer. The preferred alkyls used in the dialkyl phosphonates are C.sub.1 to C.sub.10 alkyls with methyl, ethyl and propyl being preferred. The resulting miscible compositions of the S/AN/DMSP and the SAN components may further contain rubbery polymers such as methylacrylate-butadiene-styrene polymers (MBS), acrylonitrile-butadiene-styrene polymers (ABS), acrylonitrile-styrene-acrylate rubber polymers (ASA), acrylonitrile-styrene-ethylene propylene diene monomer polymers (EPDM-g-SAN) and the like. The phosphorous component contributes to flame retardance while the rubber components impart toughness.
BRIEF DESCRIPTION OF THE DRAWING
The sole drawing is a diagram showing the glass transition temperature (T.sub.g) of 50/50 blends of SAN with a S/AN/DMSP polymer as a function of the weight percent of AN in the SAN.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The S/AN/DMSP polymers of the present invention contain from 40 to 84 weight percent of styrene (S), from 15 to 35 weight percent of acrylonitrile (AN) and from 1 to 25 weight percent of dimethylstyrene phosphonate. Preferably the amount of styrene is in the range of from 50 to 70 weight percent, the amount of acrylonitrile is in the range of from 20 to 30 weight percents and the DMSP is in t
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patent: 5274050 (1993-12-01), Guo et al.
patent: 5340883 (1994-08-01), Guo et al.
Huggard M. T. 1993, new Intumenscent Phosphorus-Based Fire Retardants, Plastics Engineering 49, Nov. 1993, 29.
Wigotsky, V., Flame Retardants, Plast. Eng 49, 10, Oct. 1993, 20.
Chem. Abstracts., vol. 72, No. 4, Jan. 26, 1970, Abstract No. 13116.
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Bayer Antwerpen S.A./N.V.
Gil Joseph C.
Nutter Nathan M.
Preis Aron
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