Process for the production of oil-containing microcapsules

Claim 2

The process of claim 1, wherein said cellulose derivative shock-preventing agent is a member selected from the group consisting of carboxymethyl cellulose, carboxyethyl cellulose, sulfated cellulose, phosphorated cellulose, and carboxymethyl hydroxyethyl cellulose.

Claim 3

The process of claim 1, wherein said starch derivative shock-preventing agent is a member selected from the group consisting of carboxymethyl starch, sulfated starch, and phosphorated starch.

Claim 4

cooling the formed coacervate to gel the same;

Claim 5

adding a phenolic compound thereto at a temperature above 8*C., during Steps (2) and (3);

Claim 6

The process of claim 1, wherein said D-galactonic acid shock-preventing agent is a member selected from the group consisting of pectin and pectinic acid.

Claim 7

The process of claim 1, wherein said vinylbenzene-sulfonic copolymer shock-preventing agent is a member selected from the group consisting of a vinylbenzenesulfonate-acryloyl-morpholine copolymer, a vinylbenzenesulfonate-acrylamide copolymer, and a vinylbenzenesulfonate-vinylpyrrolidone copolymer.

Claim 8

adding a hardening agent to the system;

Claim 9

adding a shock-preventing agent to the system at a temperature lower than the gelling point of gelatin, said shock-preventing agent being capable of preventing a rapid increase in the viscosity of the system during pre-hardening of the coacervate when the pH of the system approaches a value of from 6 to 9;

Claim 10

The process of claim 1, wherein said acrylic acid copolymer is a member selected from the group consisting of an acrylic acidacryloylmorpholine copolymer and an acrylic acid-vinylpyrrolidone copolymer.

Claim 11

The process of claim 1, wherein said phenolic compound is a member selected from the group consisting of a phenol monomer and a phenol resin.

Claim 12

adjusting the pH of the system to the alkali side, said Steps (5) through (7) constituting the pre-hardening treatment;

Claim 13

elevating the temperature of the system, the order of Steps (5) through (7) being capable of being freely modified with respect to each other, and Step (5) further being capable of being conducted prior to Step (4), said shock-preventing agent being present in an amount sufficient to prevent a rapid increase in viscosity during pre-hardening, when the pH of the system ranges from 6 to 9 and being a member selected from the group consisting of, a modified cellulose comprising polysaccharides having beta-1,4-glucoside bonds of glucoses and having anionic functional groups, an anionic starch derivative composed of a linear polysaccharide amylose formed by only alpha-1,4 bonds of D-glucose, and a branched polysaccharide amylopectin formed by mainly alpha-1,4 bonds of D-glucose and a partially side chain branched by alpha-1,6 bonds, an anionic acid polysaccharide, obtained by polycondensating linearly D-galacturonic acid between the alpha-1,4 bonds thereof, said acid polysaccharide containing pectin, pectic acid, and pectinic acid, a condensate of naphthalene sulfonic acid and Formalin, which condensate is represented by the formula:

Claim 14

The process of claim 7, wherein said phenol monomer is an aromatic compound in which the hydrogen atom attached to the ring is substituted with at least one hydroxyl group.

Claim 15

The process of claim 8, wherein said phenolic monomer is a member selected from the group consisting of substituted phenols, polyhydric phenols, phenolcarboxylic acids, nitrophenols and biphenols.

Claim 16

The process of claim 9, wherein said substituted phenol is a phenol compound having as a substituent thereof, a member selected from the group consisting of an alkyl group, an allyl group, a halogen atom, a halogen-substituted alkyl group, a cycloalkyl group, a phenyl group, a halogen-substituted phenyl group, an alkyl-substituted phenyl group, a biphenyl group, a benzyl group, and a alpha-alkylbenzyl group.

Claim 17

The process of claim 10, wherein said substituted phenols are selected from the group consisting of o-cresol, m-cresol, p-cresol, o-ethylphenol, p-t-butylphenol, p-nonylphenol, p-dodecylphenol, p-octylphenol, p-fluoro-phenol, p-chlorophenol, p-bromophenol, m-chlorophenol, p-cyclohexylphenol, o-phenylphenol, p-phenylphenol, o-(o-chlorophenyl)-phenol, p-(p-bromophenyl)-phenol, o-(2-biphenylyl)-phenol, alpha-phenyl-o-cresol, 2,4-xylenol, 3,4-xylenol, 2-allyl-p-cresol, 2,4-dichlorophenol, 2,5-dichlorophenol, 4-chloro-m-cresol, 2-chloro-4-phenylphenol, 2,3, 5-trimethylphenol, 2,3,5,6-tetramethylphenol, alpha-naphthol, and beta-naphthol.

Claim 18

The process of claim 9, wherein said polyhydricphenol is a member selected from the group consisting of resorcinol, catechol, hydroquinone, pyrogallol, fluoroglucinol, 1,2-dihydroxy-4-methylbenzene, 1,3-dihydroxy-5-methylbenzene, 3,4-dihydroxy-1-methylbenzene, 3,5-dihydroxy-1-methylbenzene, 2,4-dihydroxyethyl-benzene, t-butylhydroxyquinone, 1,3-naphthalenediol, 1,4-naphthalenediol, 1,5-naphthalenediol, 1,6-naphthalenediol, 1,7-naphthalenediol, 4-phenylpyrocatechol, 4-chlororesorcinol, phenyl-hydroquinone, 4,6-dichlororesorcinol and tetrachlorohydroquinone.

Claim 19

The process of claim 9, wherein said phenolcarboxylic acid is a member selected from the group consisting of m-oxybenzoic acid, p-oxybenzoic acid, protocatechuic acid, alpha-resorcylic acid, beta-resorcylic acid, orsellinic acid, caffeic acid, umbellic acid and gallic acid.

Claim 20

The process of claim 9, wherein said nitrophenol is a member selected from the group consisting of p-nitrophenol, m-nitrophenol and o-nitrophenol.

Claim 21

The process of claim 9 wherein said biphenol is a member selected from the group consisting of biphenol, Bicresol, dibenzylbiphenol, diethylbiphenol, dipropylbiphenol, diallylbiphenol, dihalobiphenol, diphenyltetrol, methylenediphenol, methylenebis (alkylphenol), methylenebis(benzylphenol), methylenebis(phenylphenol) and methylenebis(halophenol).

Claim 22

The process of claim 9 wherein said biphenol is a member selected from the group consisting of o-o''-biphenol, m-m''-biphenol, p-p''-biphenol, 4,4''-bi-o-cresol, 4,4''-bi-m-cresol, 6, 6''-o-cresol, 2,2''-diethyl-p,p''-biphenol, 2,2''-diallyl-p,p''-biphenol, 3,3'',5,5''-biphenyltetrol, 4,4''-methylenediphenol, 2,4''-methylenediphenol, 2,2''-methylenediphenol, 4,4''-isopropylidenediphenol, 4,4''-cyclopentylidenephenol, 4,4''-cyclohexylidenediphenol, methylenediresorcinol, 4,4''-methylene-di-o-cresol, 4,4''-methylenebis(2-chlorophenol), 4,4''-methylenebis(2,5-dichlorophenol), and 4,4''-thiodiphenol.

Claim 23

The process of claim 7, wherein said phenol resin is a phenol-aldehyde resin.

Claim 24

The process of claim 17, wherein said phenol-aldehyde resin is a water-soluble resin.

Claim 25

The process of claim 17, wherein said phenol of said phenol-aldehyde resin is a member selected from the group consisting of phenol, cresol, xylenol, an alkylphenol, and resorcinol.

Claim 26

The process of claim 17, wherein said aldehyde of said phenol-aldehyde resin is a member selected from the group consisting of formalin and p-formaldehyde.

Claim 27

The process of claim 1, wherein said phenol compound is present in an amount ranging from 1/100 to 1/2 parts by weight based on one part by weight of colloid used to form the capsule wall.

Claim 28

The process of claim 1, wherein said colloid is a member selected from the group consisting of gelatin, casein, alginate, gum arabic, carrageenan, a maleic acid-styrene copolymer, a maleic acid-methylvinyl ether copolymer, and a maleic acid-ethylene copolymer.