Ductile poly(arylene sulfide) resin compositions

Abstract

A resin composition which comprises:(A) from about 99.5 to about 70 percent by weight, based on the total weight of components (A) and (B), of a poly(arylene sulfide) having a melt viscosity of from about 300 to about 8,000 poise at 1,200 sec.sup.-1 and 310.degree. C.;(B) from about 0.5 to about 30 percent by weight, based on the total weight of components (A) and (B), of a substantially non-functionalized, emulsion cured silicone rubber which is the condensation product of (i) an organopolysiloxane having at least two active hydrogen functional groups per molecule, and (ii) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, said silicone rubber being melt dispersable with the poly(arylene sulfide); and(C) from about 0.1 to about 2.0 parts by weight, based on 100 parts by weight of components (A), (B) and (C) combined, of an aminosilane, wherein said composition has been prepared by combining components B and C with component A in the absence of a dispersion medium.

Description

Claims

1. A resin composition which comprises a melt blend of:

(A) from about 99.5 to about 70 percent by weight, based on the total weight of components (A) and (B), of a poly(arylene sulfide) polymer consisting essentially of repeating units of the formula --[Ar-S]-- wherein Ar for an individual repeating unit is a divalent radical selected from the group consisting of: ##STR4## wherein X is a divalent radical selected from the group consisting of: --SO.sub.2 --, --C(O)--, --O--, --C.sub.a H.sub.2a --, and --C(CH.sub.3).sub.2 -- wherein a is an integer having a value of 0 to 3, said poly(arylene sulfide polymer having a melt viscosity of from about 300 to about 8,000 poise as measured at 1,200 sec.sup.-1 and 310.degree. C.;

(B) from about 0.5 to about 30 percent by weight, based on the total weight of components (A) and (B), of a substantially non-functionalized, emulsion cured silicone rubber which is the condensation product of (i) an organopolysiloxane having at least two active hydrogen functional groups per molecule and (ii) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, said silicone rubber being melt dispersable with the poly(arylene sulfide); and

(C) from about 0.1 to about 2.0 parts by weight, based on 100 parts by weight of components (A), (B) and (C) combined, of an aminosilane, wherein said composition has been prepared by combining components B and C with component A in the absence of a dispersion medium.

2. A resin composition as described in claim 1 wherein the poly(arylene sulfide) is poly(phenylene sulfide).

3. A resin composition as described in claim 2 wherein the organohydrogenpolysiloxane is selected from the group consisting of trimethylsiloxy-terminated methylhydrogenpolysiloxanes; trimethylsiloxy-terminated dimethylsiloxane-methylhydrogensiloxane copolymers; methylhydrogensiloxy-terminated dimethylsiloxane-methylhydrogensiloxane copolymers; dimethylsiloxane-methylhydrogensiloxane cyclic copolymers; copolymers composed of (CH.sub.3).sub.2 HSiO.sub.1/2 units and SiO.sub.4/2 units; and copolymers composed of (CH.sub.3).sub.3 SiO.sub.1/2 units, (CH.sub.3).sub.2 HSiO.sub.1/2 units and SiO.sub.4/2 units.

4. A resin composition as described in claim 3 wherein the silicone rubber is in the form of spherical particles having an average particle diameter of from about 0.5 .mu.m to about 100 .mu.m prior to melt blending and wherein the silicone rubber is prepared by a process which comprises the steps of:

(a) creating a homogeneous aqueous dispersion of an organopolysiloxane having at least two active hydrogen functional groups per molecule, an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, and a curing catalyst;

(b) contacting the aqueous dispersion with a curing medium selected from the group consisting of higher temperature non-reactive liquids and gases to effect curing of the polysiloxane components; and

(c) recovering the cured rubber.

5. A composition as described in claim 4 wherein the aminosilane is represented by the formula:

[RO].sub.3 Si [(CH.sub.2).times.(NH(CH.sub.2).sub.y).sub.z NH.sub.2 ]

wherein R represents an alkyl group having 1 to 4 carbon atoms, x is an integer having a value of 1 to 4, y is an integer having a value of 1 to 4, and z is an integer having a value from 0 to 2.

6. A composition as described in claim 5 wherein the aminosilane is selected from the group consisting of gamma-aminopropyltrimethoxysilane; gamma-aminopropyltriethoxysilane; N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane; and trifunctional silanes of the formula:

H.sub.2 NCH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 CH.sub.2 Si(OCH.sub.3).sub.3.

7.

7. A composition as described in claim 1 wherein the aminosilane is gamma-aminopropyltriethoxysilane.

8. A composition as described in claim 7 wherein the silicone rubber is the reaction product of a dimethylpolysiloxane homopolymer having terminal hydroxyl groups at both ends of its molecular chain and a siloxy-terminated methylhydrogenpolysiloxane having at least two active hydrogen functional groups per molecule.

9. A composition as described in claim 1 where then silicone rubber has an average particle diameter of from about 1 .mu.m to about 10 .mu.m prior to melt blending.

10. A composition as described in claim 1 wherein the silicone rubber is present in an amount of from about 5 to about 20 percent by weight, based on the total weight of components (A) and (B).

11. A composition as described in claim 1 which further comprises at least one additional component selected from the group consisting of fillers, antioxidants, heat stabilizers, ultraviolet stabilizers, mold release agents, lubricants, plasticizers, flame retardants and pigments.

12. A composition which consists essentially of a melt blend of:

(A) from about 85 to about 93 percent by weight, based on the total weight of components (A) and (B) of a poly(phenylene sulfide) having a melt viscosity of from about 1,000 to about 5,000 poise at 1,200 sec.sup.-1 and 310.degree.;

(B) from about 15 to about 7 percent by weight, based on the total weight of components (A) and (B) of a substantially non-functionalized, emulsion cured silicone rubber which is the reaction product of a dimethylpolysiloxane homopolymer having terminal hydroxyl groups at both ends of its molecular chain and a trimethylsiloxy-terminated methylhydrogenpolysiloxaneorganopolysiloxane having at least two terminal active hydrogen functional groups per molecule, wherein the silicone rubber has an average particle size of from about 1 .mu.m to about 10 .mu.m prior to incorporation into the composition said silicone rubber being melt dispersible with the poly(arylene sulfide); and

(C) from about 0.1 to about 0.7 parts by weight, per 100 parts by weight of components (A), (B), and (C) combined of an aminofunctionalized silane of the formula:

[RO].sub.3 Si[(CH.sub.2).sub.3 NH.sub.2 ]

wherein R represents an alkyl group having 1 to 2 carbon atoms, and wherein said composition has been prepared by combining components B and C with component A in the absence of a dispersion medium.

13. A resin composition as described in claim 12 wherein the poly(phenylene sulfide) has a melt viscosity of about 1,000 poise to about 5,000 poise at 1,200 sec.sup.-1 and 310.degree. C.

14. A process for producing a poly(arylene sulfide) resin which comprises the steps of:

(1) combining in a substantially anhydrous state:

(A) from about 99.5 to about 70 percent by weight, based on the total weight of components (A) and (B), of a poly(arylene sulfide) having an melt viscosity of from about 300 to about 8,000 poise as measured at 1,200 sec.sup.-1 and 310.degree. C.;

(B) from about 0.5 to about 30 percent by weight, based on the total weight of components (A) and (B), of an emulsion cured silicone rubber which is the condensation product of (i) an organopolysiloxane having at least two active hydrogen functional groups per molecule and (ii) and organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule,

to form a dry or melt blend of poly(arylene) sulfide and silicone rubber;

(2) introducing into the blend of step 1 an aminosilane in an amount of from about 0.1 to about 2.0 parts by weight, based on 100 parts by weight of component (A), component (B), and the aminosilane combined; and

(3) melt extruding the blend of step 2.

15. A film formed from a resin composition as described in claim 1 wherein the silicone rubber is present in said resin composition in an amount of from about 0.5 to about 10 percent by weight, based on the total weight of components (A) and (B).

16. A resin composition which comprises:

(A) from about 99.5 to about 70 percent by weight, based on the total weight of components (A) and (B), of a poly(phenylene sulfide) having a melt viscosity of from about 300 to about 8,000 poise as measured at 1,200 sec.sup.-1 and 310.degree. C. wherein the poly(arylene sulfide) is a polymer consisting essentially of repeating units of the formula: ##STR5## wherein Ar for an individual repeating unit is a divalent radical selected from the group consisting of: ##STR6## wherein X is a divalent radical selected from the group consisting of: --SO.sub.2 --, --C(O)--, --O--, --C.sub.a H.sub.2 a--, and --C(CH.sub.3).sub.2 -- wherein a is an integer having a value of 0 to 3;

(B) from about 0.5 to about 30 percent by weight, based on the total weight of components (A) and (B), of an emulsion cured silicone rubber which is the condensation product of (i) an organopolysiloxane having at least two active hydrogen functional groups per molecule and (ii) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule; and

(C) from about 0.1 to about 2.0 parts by weight, based on 100 parts by weight of components A, B and C combined, of an aminosilane of the formula:

[RO].sub.3 Si[(CH.sub.2).times.(NH(CH.sub.2).sub.y).sub.z NH.sub.2 ](I)

wherein R represents an alkyl group having 1 to 4 carbon atoms, x is an integer having a value of 1 to 4, y is an integer having a value of 1 to 4, and z is an integer having a value from 0 to 2.

17. A resin composition as described in claim 16 wherein the poly(arylene sulfide) is poly(phenylene sulfide).

18. An impact modified poly(phenylene sulfide) resin composition wherein the impact modifier thereof consists of:

(I) a substantially non-functionalized, emulsion cured silicone rubber which is the condensation product of (I) an organopolysiloxane having at least two active hydrogen functional groups per molecule and (ii) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule, and

(II) an aminosilane

wherein said impact modifier components (I) and (II) are incorporated into the poly(phenylene sulfide) resin composition by means of melt blending.

19. A composition as described in claim 18 wherein said silicone rubber has an average particle size of from about 1 .mu.m to about 10 .mu.m prior to melt blending.

20. A composition as described in claim 19 wherein said silicone rubber is present in an amount of at least about 5 percent by weight based on the total weight of the poly(phenylene sulfide), silicone rubber and aminosilane combined.

21. A composition as described in claim 20 wherein said aminosilane is present in an amount of from about 0.1 to about 2.0 percent by weight based on the total weight of the poly(phenylene sulfide), silicone rubber and aminosilane combined.