US4608187A — Rubber toughened polyvinyl alcohol film compositi…

Claim 1

Independent Claim 73 words

A sealed envelope comprising: a self-supporting film, formed by a polymeric matrix comprising at least about 50 wt. % polyvinyl alcohol, and containing a plurality of microdomains dispersed therethroughout, the plurality of microdomains consisting essentially of a rubbery material which is at least partially incompatible with the polyvinyl alcohol and has a glass transition temperature of less than about 0° C., the microdomains being at least about 3 wt. % of the film.

Claim 2

Dependent Claim 73 words

A sealed envelope comprising: a self-supporting film, formed by a polymeric matrix comprising at least about 50 wt. % polyvinyl alcohol, and containing a plurality of microdomains dispersed therethroughout, the plurality of microdomains consisting essentially of a rubbery material which is at least partially incompatible with the polyvinyl alcohol and has a glass transition temperature of less than about 0° C., the microdomains being at least about 3 wt. % of the film.

Claim 3

Dependent Claim 33 words

The envelope as in claim 1 wherein the polyvinyl alcohol of the polymeric matrix is in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.

Claim 4

Dependent Claim 33 words

The envelope as in claim 1 wherein the polyvinyl alcohol of the polymeric matrix is in a weight ratio with respect to the plurality of microdomains of between about 19:1 to about 6:1.

Claim 5

Dependent Claim 23 words

The envelope as in claim 1 wherein the microdomains are from about 5 wt. % to about 15 wt. % of the film.

Claim 6

Dependent Claim 20 words

The envelope as in claim 1 wherein substantially all of the microdomains are less than about 10 microns in size.

Claim 7

Dependent Claim 24 words

The envelope as in claim 5 wherein at least most of the microdomains are from about 0.5 micron to about 2 micron in size.

Claim 8

Dependent Claim 24 words

The envelope as in claim 3 wherein the rubbery material of the microdomains has a glass transition temperature of about -18° C. or less

Claim 9

Dependent Claim 20 words

The envelope as in claim 3 wherein the rubbery material of the microdomains is acrylate, styrene-butadiene co-polymer, neoprene or isoprene.

Claim 10

Dependent Claim 17 words

The envelope as in claim 1 further comprising a liquid detergent within the film and contained thereby.

Claim 11

Dependent Claim 15 words

The envelope as in claim 9 wherein the liquid detergent has substantially no free water.

Claim 12

Dependent Claim 13 words

The envelope as in claim 10 wherein the film is dispersible in water.

Claim 13

Dependent Claim 112 words

An article useful for treating fabrics comprising: a flexible pouch, the pouch being resistant to breakage at low temperature and low relative humidity, the pouch formed by a plastic phase and a rubber phase, the plastic phase including polyvinyl alcohol and being in an amout of from about 70 wt. % to about 97 wt. % of the pouch, the rubber phase being at least partially incompatible with the polyvinyl alcohol and having a glass transition temperture at or below about -18° C. and being in an amount of from at least about 3 wt. % to about 30 wt. % of the pouch; and, a laundering aid disposed within the pouch.

Claim 14

Dependent Claim 112 words

An article useful for treating fabrics comprising: a flexible pouch, the pouch being resistant to breakage at low temperature and low relative humidity, the pouch formed by a plastic phase and a rubber phase, the plastic phase including polyvinyl alcohol and being in an amout of from about 70 wt. % to about 97 wt. % of the pouch, the rubber phase being at least partially incompatible with the polyvinyl alcohol and having a glass transition temperture at or below about -18° C. and being in an amount of from at least about 3 wt. % to about 30 wt. % of the pouch; and, a laundering aid disposed within the pouch.

Claim 15

Dependent Claim 32 words

The article as in claim 12 wherein: the polyvinyl alcohol of the plastic phase has a molecular weight of from about 10,000 to about 100,000 and is about 70% to 100% hydrolyzed.

Claim 16

Dependent Claim 29 words

The article as in claim 12 wherein: the rubber phase includes polysiloxane, polyethylene, polyoxyethylene, neoprene, isoprene, natural rubber, acrylate, styrene-butadiene copolymer, polyisobutylene, polypropylene polyvinyl-fluoride, polyvinylidene chloride or mixtures thereof.

Claim 17

Dependent Claim 48 words

The article as in claim 13 wherein the rubber phase is a polymer selected from the group consisting of acrylate, styrene-butadiene copolymer, neoprene and isoprene and is in a weight ratio with respect to the polyvinyl alcohol of the plastic phase of from about 19:1 to about 6:1.

Claim 18

Dependent Claim 24 words

The article as in claim 15 wherein a wall of the pouch has a thickness of from about 0.05 mm to about 0.5 mm.

Claim 19

Dependent Claim 15 words

The article as in claim 16 wherein the pouch is soluble in an aqueous solution.

Claim 20

Dependent Claim 96 words

A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and, a plurality of microdomains dispersed throughout the polymeric matrix and being at least partially incompatible with the polyvinyl alcohol, the microdomains being from about 0.5 to about 10 microns in size, the microdomains having a glass transition temperature of less than about 0° C., the microdomains being at least about 3 wt. % of the film, the polyvinyl alchol of the polymeric matrix being in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.

Claim 21

Dependent Claim 96 words

A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and, a plurality of microdomains dispersed throughout the polymeric matrix and being at least partially incompatible with the polyvinyl alcohol, the microdomains being from about 0.5 to about 10 microns in size, the microdomains having a glass transition temperature of less than about 0° C., the microdomains being at least about 3 wt. % of the film, the polyvinyl alchol of the polymeric matrix being in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.

Claim 22

Dependent Claim 19 words

The film as in claim 18 wherein a thickness thereof is from about 0.05 mm to about 0.5 mm.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-08-25	1990-02-24	1990-08-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-08-25	1994-02-24	1994-08-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-08-25	1998-02-24	1998-08-26	$7700.00	Window Closed / Lapsed

Rubber toughened polyvinyl alcohol film compositions

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