Back to results
US 4,358,559 AGranted
Tacky fluoroelastomer compositions
AssigneeMinnesota Mining and Manufacturing Company
InventorsAllen G. Holcomb, Bruce H. Spoo
Life of this patent
Estimating the term…
Abstract
A tacky gum stock composition comprising fluoro-elastomer gum, an excess of a curing amount of normally liquid fluoroaliphatic polyol or normally liquid mixture thereof, organo-onium compound, and acid acceptor is shaped and cured to form shaped elastomeric articles.
Claims10
A tacky fluoroelastomer gum stock composition, comprising a blend of:
- (a) an elastomeric fluoropolymer gum, said gum being a copolymer of monomers comprising vinylidene fluoride and at least one other terminally ethylenically unsaturated fluorine-containing comonomer;
- (b) from about 75 to about 750 parts by weight per one hundred parts by weight of said fluoropolymer gum, of a normally liquid fluoroaliphatic polyol, or a normally liquid mixture of two or more fluoroaliphatic polyols;
- and
- (c) about 1 to 20 millimoles per one hundred grams of said fluoropolymer gum, of one or more organo-onium cocuring agent(s) selected from the group consisting of organoammonium, organoarsonium, organophosphonium, or organosulfonium compounds
- which composition in reactive association with an acid acceptor forms a tacky curable gum stock composition which, upon exposure to heat, will cure into an elastomer.
2 more elements
A method of making a shaped article, comprising the steps of:
- (a) admixing with fluoropolymer gum, per one hundred grams thereof, from about 75 to 750 grams of normally liquid fluoroaliphatic polyol or normally liquid mixture of fluoroaliphatic polyols, said polyol(s) having:
- (1) carbon-carbon skeletal structure(s) which can be interrupted by oxygen atoms bonded only to carbon atoms, (2) non-skeletal valences of said structure(s) satisfied by H or F atoms, or OH or fluoroalkyl groups, with no more than 50% of such non-skeletal valences being satisfied by H atoms, and (3) for each said fluoroaliphatic polyol, at least two hydroxyl groups each bonded to carbon atoms bonded only to H atoms or fluoroalkyl groups;
- from about 4 to 30 millimoles of organo-onium cocuring agent selected from compounds of the formulas
- (i) (R.sup.1).sub.4 Q.sup.+1 (X.sup.-m).sub.1/m,
- (ii) (R.sup.1).sub.3 QR.sup.2 Q(R.sup.1).sub.3.sup.+2 (X.sup.-m).sub.2/m,
- (iii) (R.sup.3).sub.3 S.sup.+1 (X.sup.-m).sub.1/m, or
- (iv) (R.sup.3).sub.2 SR.sup.4 S(R.sup.3).sub.2.sup.+2 (X.sup.-m).sub.2/m
- wherein Q is a nitrogen, arsenic or phosphorus atom, S is sulfur, X.sup.- is an anion having a valence of m, each R.sup.1 is a monovalent organic radical containing 1 to 20 carbon atoms, is the same as or different from any other R.sup.1, and can combine with another R.sup.1 to form a cyclic structure containing a Q atom, R.sup.2 is a divalent organic radical containing 2 to 12 carbon atoms, each R.sup.3 is a monovalent organic radical containing 1 to 20 carbon atoms, is the same as or different from any other R.sup.3, and can combine with another R.sup.3 to form a cyclic structure containing an S atom, R.sup.4 is a divalent organic radical containing 2 to 12 carbon atoms;
- and at least one R.sup.3 or R.sup.4 group is aromatic;
- and from about 0.5 to 40 grams of acid acceptor;
- (b) shaping said admixture by molding, extruding, or applying said admixture to one or more surfaces comprising cured or uncured fluoroelastomer;
- and
- (c) subjecting said shaped admixture to sufficient heat and pressure to form a vulcanized shaped article.
10 more elements
Dependencies are inferred from the claim text.