Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1982-03-03
1983-05-10
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08K 512
Patent
active
043830692
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to polyarylene sulphide compositions.
Polyarylene sulphides have properties which make them suitable for use in various situations, for example as plain bearing linings. However, they also possess properties which make their preparation and application inconvenient and frequently difficult.
Available techniques involve the use of toxic chemicals or techniques involving what is essentially powder fusion. The powder fusion techniques limit the roles in which polyarylene sulphides can be used and involve slow processes of low productivity.
One of the properties of polyarylene sulphides which limits their use is their high viscosities in the molten state. This renders the distribution of the material difficult in the extreme and makes it difficult therefore to establish a bond between the polyarylene sulphide and another material. One known method of forming a bond between the polyarylene sulphide and another material is to apply the polyarylene sulphide powder to the other material as level and evenly as possible, and then to melt, cure and cross-link the powder. Water based dispersions of PPS are also known but this is just another form of applying powder since this is what remains after the water has been evaporated.
However, as stated above, using polyarylene sulphide powder involves considerable manufacturing difficulties. Polyphenylene sulphide takes a long time to cure and crosslink particularly when the powder layer is relatively thick. Also since the molten powder has a high viscosity and generally does not flow or wet a surface very well, this results in voids and consequently a poor bond between the polyphenylene sulphide and the other material which bond may fail when under load.
It is also difficult to achieve a precision thickness of polyarylene sulphide which is dimensionally stable and even more difficult to produce very thin, cured layer.
It is an object of the present invention to provide polyarylene sulphide in a workable form in order to minimise the above difficulties in its use.
The present invention is based on the discovery that benzyl benzoate has a plasticizing action on polyphenylene sulphide.
According to the present invention a composition of matter is characterised in that it comprises polyarylene sulphide with an aryl ester of an aryl alcohol, the ester being in solution in the resin.
The resin phase may further include other resins besides polyarylene sulphide in either a major or minor proportion based on the polyarylene sulphide. Such other resins may include polytetrafluoroethylene, polyimides and polysulphones. The resin phase may also include fillers, pigments, dyes, surface active additives, stabilizers, cross-linking agents, coating aids such as silica or titanium oxide powders, and bases to enhance bonding.
The ester of "solvent" phase may include or comprise mixtures of aryl esters of aryl alcohols, for example one or more of benzyl benzoate, benzyl phthalate, benzyl isophthalate, and benzyl terephthalate, and other materials acting as diluents or extenders or viscosity reducers for the active solvent and having no non-solvent action such as to prevent the blend having the necessary plasticiser or solvent action for the resin phase as the case may be.
The solvent phase may also include co-solvents which whilst having no significant solvent action on their own enhance the solvent action of the benzyl benzoate.
The solvent phase may also include other solvents for polyphenylene sulphide and when the resin phase includes other resins, solvents for such other resins even if these are not solvents for polyphenylene sulphide though in this case they are preferably miscible with benzyl benzoate to form a single solvent phase.
The compositions of the invention may include solid particulate materials containing polyphenylene sulphide plasticized by benzyl benzoate or solid workable bodies of polyphenylene sulphide plasticized by benzyl benzoate. The compositions may take the form of sheets, films, tapes or fibres and may be stored and used as requir
REFERENCES:
patent: 3354129 (1967-11-01), Edmonds, Jr.
patent: 3699087 (1972-10-01), Wood et al.
patent: 3725362 (1973-04-01), Walker
patent: 4038262 (1977-07-01), Edmonds, Jr.
Schofer Joseph L.
Serofim N.
The Glacier Metal Company Limited
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