US4382358A — String of a vinylidene fluoride synthetic resin c…

Claim 1

Independent Claim 94 words

A string for the stringing of rackets, bows, musical instruments and the like, comprising a thread-like structure having at least one monofil of a synthetic resin mixture containing 99-86% by weight of polyvinylidene fluoride and 1-14% by weight of at least one polyacrylate selected from the group consisting of a polyacrylate homopolymer, a copolymer of vinylidene fluoride monomer with at least one acrylate monomer, and mixtures thereof, which is stretch-oriented to impart improved elasticity thereto; said monofil exhibiting an attenuation between -20° C. and 30° C. that closely approaches that of natural gut string.

Claim 2

Dependent Claim 94 words

A string for the stringing of rackets, bows, musical instruments and the like, comprising a thread-like structure having at least one monofil of a synthetic resin mixture containing 99-86% by weight of polyvinylidene fluoride and 1-14% by weight of at least one polyacrylate selected from the group consisting of a polyacrylate homopolymer, a copolymer of vinylidene fluoride monomer with at least one acrylate monomer, and mixtures thereof, which is stretch-oriented to impart improved elasticity thereto; said monofil exhibiting an attenuation between -20° C. and 30° C. that closely approaches that of natural gut string.

Claim 3

Dependent Claim 21 words

A string according to claim 1, wherein the polyacrylate comprises polymethyl methacrylate, polymethyl acrylate, polyethyl acrylate, polypropyl acrylate, and mixtures thereof.

Claim 4

Dependent Claim 66 words

A string according to claim 1, wherein the polyacrylate comprises a copolymer of vinylidene fluoride monomer with 10-30% by weight of at least one acrylate monomer selected from the group of the alkyl acrylates and alkyl methacrylates, wherein the alkyl groups are lower alkyl groups of 1-4 carbon atoms and wherein the acrylate proportion in said mixture is calculated from the acrylate content of the copolymer.

Claim 5

Dependent Claim 29 words

A string according to one of claims 1-3, wherein the synthetic resin mixture comprises a mixture of polyvinylidene fluoride, polymethyl methacrylate, and vinylidene fluoride-alkyl acrylate or alkyl methacrylate copolymer.

Claim 6

Dependent Claim 19 words

A string according to claim 1, wherein the vinylidene fluoride-acrylate copolymer contains 10-30% by weight of the acrylate monomer.

Claim 7

Dependent Claim 35 words

A string according to claim 1, wherein the synthetic resin mixture contains, besides polyvinylidene fluoride, 1 to 8% by weight of a polyacrylate homopolymer, and up to 25% by weight of a vinylidene fluoride-acrylate copolymer.

Claim 8

Dependent Claim 26 words

A string according to claim 1, wherein the synthetic resin contains 90-95% by weight of polyvinylidene fluoride and 10-5% by weight of at least one polyacrylate.

Claim 9

Dependent Claim 25 words

A string according to claim 1, wherein said string consists of a bundle of monofils which are twisted, braided or otherwise connected with each other.

Claim 10

Dependent Claim 25 words

A string according to claim 1, wherein the monofil is axially stretched in a ratio of between 1:3 to 1:10, and preferably 1:4 to 1:5.

Claim 11

Dependent Claim 30 words

A string according to claim 9, wherein the monofil is subjected to subsequent stretching, wherein this subsequent stretching step effects an elongation of the monofil of between 1 and 3%.

Claim 12

Dependent Claim 20 words

A string according to claim 1, wherein the monofil is provided with a coating with reduces the coefficient of friction.

Claim 13

Dependent Claim 58 words

A string according to claim 1, wherein the monofil is useful for stringing for ball rackets, wherein the monofils have an elasticity of 2.7 to 3.6×10 -4 N -1 at a pretensioning force of 200 N, an ultimate elongation of 16-30%, a tear strength of between 300 and 500 N/mm 2 , with a diameter of 1.2-1.5 mm.

Claim 14

Dependent Claim 149 words

A process for the production of a string of a synthetic resin based on polyvinylidene fluoride which comprises extruding a synthetic resin rod from a melt consisting essentially of a synthetic resin mixture containing 99-86% by weight of polyvinylidene fluoride and 1-14% by weight of at least one polyacrylate selected from the group consisting of a polyacrylate homopolymer, a copolymer of vinylidene fluoride monomer with at least one acrylate monomer, and mixtures thereof at a melt temperature of 250°-350° C., cooling the resulting rod to a temperature of 60°-150° C. with subsequent axial stretching of the cooled rod at a ratio of 1:3 to 1:10; cooling the rod further to room temperature, subjecting the thus-obtained monofil to elongation by winding the monofil on a support with a uniform tensile force of from 150-300 N and thereafter storing the wound monofil for a period of from 5 to 60 minutes.

Claim 15

Dependent Claim 149 words

A process for the production of a string of a synthetic resin based on polyvinylidene fluoride which comprises extruding a synthetic resin rod from a melt consisting essentially of a synthetic resin mixture containing 99-86% by weight of polyvinylidene fluoride and 1-14% by weight of at least one polyacrylate selected from the group consisting of a polyacrylate homopolymer, a copolymer of vinylidene fluoride monomer with at least one acrylate monomer, and mixtures thereof at a melt temperature of 250°-350° C., cooling the resulting rod to a temperature of 60°-150° C. with subsequent axial stretching of the cooled rod at a ratio of 1:3 to 1:10; cooling the rod further to room temperature, subjecting the thus-obtained monofil to elongation by winding the monofil on a support with a uniform tensile force of from 150-300 N and thereafter storing the wound monofil for a period of from 5 to 60 minutes.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-05-09	1986-11-08	1987-05-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-05-09	1990-11-08	1991-05-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-05-09	1994-11-08	1995-05-10	$7700.00	Window Closed / Lapsed

String of a vinylidene fluoride synthetic resin composition

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