Abstract: Porous acrylic synthetic fibers having water absorption property and having substantially no microvoids but having mainly macrovoids are produced by spinning an organic solvent solution containing 15.about.35% by weight of a polymer consisting of 2.about.30 parts by weight of cellulose acetate and 70.about.98 parts by weight of an acrylic polymer into a coagulation bath at a temperature of no higher than 30.degree. C., primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0 times to form water swelled fibers wherein macrovoids are distributed, drying the water swelled fibers at a temperature of 100.degree..about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat to elongate the macrovoid structure.This invention includes acrylic composite fibers having water absorption property wherein at least one of components A and B consisting of 2.about.50% by weight of cellulose acetate and 50.about.

Abstract: Porous acrylic synthetic fibers having water absorption property and having substantially no microvoids but having mainly macrovoids are produced by spinning an organic solvent solution containing 15.about.35% by weight of a polymer consisting of 2.about.30 parts by weight of cellulose acetate and 70.about.98 parts by weight of an acrylic polymer into a coagulation bath at a temperature of no higher than 30.degree. C., primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0 times to form water swelled fibers wherein macrovoids are distributed, drying the water swelled fibers at a temperature of 100.about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat to elongate the macrovoid structure.This invention includes acrylic composite fibers having water absorption property wherein at least one of components A and B consisting of 2.about.50% by weight of cellulose acetate and 50.about.

Abstract: Porous acrylic synthetic fibers having water absorption property and having substantially no microvoids but having mainly macrovoids are produced by spinning an organic solvent solution containing 15.about.35% by weight of a polymer consisting of 2.about.30 parts by weight of cellulose acetate and 70.about.98 parts by weight of an acrylic polymer into a coagulation bath at a temperature of no higher than 30.degree. C., primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0 times to form water swelled fibers wherein macrovoids are distributed, drying the water swelled fibers at a temperature of 100.about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat to elongate the macrovoid structure.This invention includes acrylic composite fibers having the water absorption property, wherein at least one of components A and B consisting of 2.about.50% by weight of cellulose acetate and 50.about.

Abstract: Porous flame retarded acrylic synthetic fibers consisting of cellulose acetate and a modacrylic copolymer containing vinyl chloride and/or vinylidene chloride are produced by spinning an organic solvent solution of a polymer consisting of cellulose acetate and the above described modacrylic copolymer into a coagulation bath, primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0, drying the water swelled fibers at 100.degree..about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat at a draw ratio of no greater than 3 times.

Abstract: Phosphorodithiolate compounds of the formula: ##EQU1## wherein R.sub.1 is methyl or ethyl, R.sub.2 is allyl or halogen-substituted allyl and R is n-propyl or n-butyl, provided that R is n-propyl when R.sub.2 is halogen-substituted allyl and R is n-butyl when R.sub.2 is allyl, which are useful as nematocides controlling a wide variety of injurious nematodes and giving little phytotoxicity to plants.