US4144079A — Rayon fibers containing starch

Claim 1

Independent Claim 69 words

Process for preparing starch-containing rayon fibers which comprises forming a slurry of starch granules in aqueous medium, adding sodium hydroxide (NaOH) to said slurry to produce an aqueous alkaline solution of starch, blending said solution with viscose, extruding the starch-containing viscose in fiber form and regenerating the cellulose in the extruded viscose to form starch-containing regenerated cellulose fibers, said starch having an amylopectin content of at least 60 percent.

Claim 2

Dependent Claim 69 words

Process for preparing starch-containing rayon fibers which comprises forming a slurry of starch granules in aqueous medium, adding sodium hydroxide (NaOH) to said slurry to produce an aqueous alkaline solution of starch, blending said solution with viscose, extruding the starch-containing viscose in fiber form and regenerating the cellulose in the extruded viscose to form starch-containing regenerated cellulose fibers, said starch having an amylopectin content of at least 60 percent.

Claim 3

Dependent Claim 17 words

Process as in claim 1 in which the proportion of starch is about 5 to 100% b.o.c.

Claim 4

Dependent Claim 17 words

Process as in claim 1 in which the proportion of starch is about 5 to 25% b.o.c.

Claim 5

Dependent Claim 17 words

Process as in claim 1 in which the proportion of starch is about 10 to 20% b.o.c.

Claim 6

Dependent Claim 33 words

Process as in claim 1 in which the NaOH concentration in said solution is between 2 and 41/2%, based on the weight of water and NaOH and said granules are of corn starch.

Claim 7

Dependent Claim 19 words

Process as in claim 5 in which the concentration of the starch in solution is about 6 to 20%.

Claim 8

Dependent Claim 24 words

Process as in claim 1 in which the NaOH concentration in said solution is such that in the "microscope method" the grain boundaries disappear.

Claim 9

Dependent Claim 19 words

Process as in claim 7 in which the concentration of the starch in solution is about 6 to 20%.

Claim 10

Dependent Claim 18 words

Process as in claim 1 in which said slurry contains a starch chain-splitting agent active in alkaline medium.

Claim 11

Dependent Claim 13 words

Process as in claim 9 in which said chain-splitting agent comprises hydrogen peroxide.

Claim 12

Dependent Claim 24 words

Process as in claim 10 in which the concentration of H 2 O 2 is at least 0.01% based on the weight of water.

Claim 13

Dependent Claim 56 words

Process as in claim 9 in which the proportion of chain-splitting agent is such as to produce the alkaline starch solution having a concentration of 14 to 20% starch and a viscosity of about 35-170 poises, said viscosity being lower than that of a corresponding starch solution which has not been subjected to said chain-splitting agent.

Claim 14

Dependent Claim 85 words

Process for preparing starch-containing rayon fibers which comprises dissolving corn starch granules in an aqueous alkaline medium which contains between 2 and 41/2% NaOH based on the total weight of water and NaOH, the concentration of starch in the resulting solution being about 6 to 20%, and blending said solution with viscose and extruding the starch-containing viscose in fiber form and regenerating the cellulose in the extruded viscose to form starch-containing regenerated cellulose fibers, said starch having an amylopectin content of at least 60 percent.

Claim 15

Dependent Claim 85 words

Process for preparing starch-containing rayon fibers which comprises dissolving corn starch granules in an aqueous alkaline medium which contains between 2 and 41/2% NaOH based on the total weight of water and NaOH, the concentration of starch in the resulting solution being about 6 to 20%, and blending said solution with viscose and extruding the starch-containing viscose in fiber form and regenerating the cellulose in the extruded viscose to form starch-containing regenerated cellulose fibers, said starch having an amylopectin content of at least 60 percent.

Claim 16

Dependent Claim 59 words

Process for producing rayon fibers which comprises extruding a viscose solution, containing about 5 to 25% dissolved starch b.o.c., to form a plastic stretchable fiber and then stretching said plastic fiber at least 50% to form fibers having a tenacity of at least about 2 grams per denier, said starch having an amylopectin content of at least 60 percent.

Claim 17

Dependent Claim 59 words

Process for producing rayon fibers which comprises extruding a viscose solution, containing about 5 to 25% dissolved starch b.o.c., to form a plastic stretchable fiber and then stretching said plastic fiber at least 50% to form fibers having a tenacity of at least about 2 grams per denier, said starch having an amylopectin content of at least 60 percent.

Claim 18

Dependent Claim 37 words

Process as in claims 14 in which said viscose solution is extruded into an aqueous coagulating bath containing H 2 SO 4 and at least 0.5% ZnSO 4 and is stretched at a temperature about 70° C.

Claim 19

Dependent Claim 29 words

Process as in claim 15 in which said coagulating bath containing about 6-13% H 2 SO 4 about 0.5-5% ZnSO 4 and about 12-25% Na 2 SO 4 .

Claim 20

Dependent Claim 7 words

Product of the process of claim 14.

Claim 21

Dependent Claim 29 words

Process as in claim 14 in which the viscose contains a regeneration retarder, the stretching is at least 100% and the resulting fiber has a wet modulus above 7.

Claim 22

Dependent Claim 7 words

Product of the process of claim 18.

Claim 23

Dependent Claim 42 words

Process as in claim 15 in which the stretching conditions are such as to produce coagulated regenerated filaments having a skin and a partly exposed core and the stretched filaments are cut into staple fibers and then relaxed to form crimped fibers.

Claim 24

Dependent Claim 7 words

Product of the process of claim 20.

Claim 25

Dependent Claim 63 words

Process which comprises extruding in fiber form a viscose containing about 5 to 100% dissolved starch b.o.c. and an anionic polymer dispersed in said viscose and coagulating the extruded solution to form fibers containing dispersed anionic polymer and having an increased fluid holding capacity because of the presence of said anionic polymer, said starch having an amylopectin content of at least 60 percent.

Claim 26

Dependent Claim 63 words

Process which comprises extruding in fiber form a viscose containing about 5 to 100% dissolved starch b.o.c. and an anionic polymer dispersed in said viscose and coagulating the extruded solution to form fibers containing dispersed anionic polymer and having an increased fluid holding capacity because of the presence of said anionic polymer, said starch having an amylopectin content of at least 60 percent.

Claim 27

Dependent Claim 23 words

Process as in claim 22 in which the amount of said anionic polymer dispersed in said viscose is at least about 10% b.o.c.

Claim 28

Dependent Claim 7 words

Product of the process of claim 22.

Claim 29

Dependent Claim 25 words

Process as in claim 23 in which said anionic polymer has at least about 0.2 gram equivalent of salt forming anionic groups per 100 grams.

Claim 30

Dependent Claim 14 words

Process as in claim 25 in which said anionic polymer comprises a sodium polyacrylate.

Claim 31

Dependent Claim 14 words

Process as in claim 25 in which said anionic polymer comprises sodium carboxymethyl cellulose.

Claim 32

Dependent Claim 50 words

Process which comprises extruding in fiber form a viscose containing about 5 to 100% dissolved starch b.o.c. and polyvinylpyrollidone and coagulating the extruded solution to form fibers having increased fluid holding capacity because of the presence of said polyvinylpyrollidone, said starch having an amylopectin content of at least 60 percent.

Claim 33

Dependent Claim 50 words

Process which comprises extruding in fiber form a viscose containing about 5 to 100% dissolved starch b.o.c. and polyvinylpyrollidone and coagulating the extruded solution to form fibers having increased fluid holding capacity because of the presence of said polyvinylpyrollidone, said starch having an amylopectin content of at least 60 percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-03-12	1982-09-11	1983-03-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-03-12	1986-09-11	1987-03-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-03-12	1990-09-11	1991-03-13	$7700.00	Window Closed / Lapsed

Rayon fibers containing starch

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