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2 161 633

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Application

99112380/04, 1999-06-15

(24)

Start date

1999-06-15

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Actual filing date

1999-06-15

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Published

2001-01-10

(72)

Inventor

Drozdov M.A.Gumenjuk G.Ja.Pokrovskij A.V.Berdonosova S.N.

(73)

Holder

Spetsial'Noe Konstruktorsko-Tekhnologicheskoe Bjuro Sankt-Peterburgskogo Gosudarstvennogo Tekhnologicheskogo Instituta Universiteta)

METHOD OF REUSING PYROXYLIN POWDERS INTO POLYMER BASE FOR NITROCELLULOSE VARNISH-AND-PAINT MATERIALS Russian patent published in 2001 - IPC

Abstract RU 2161633 C1

FIELD: explosives and varnish-and-paint industry. SUBSTANCE: pyroxylin powders are ground and then nitrogen level and degree of polymerization of cellulose nitrates are reduced by means of treating ground powders in aqueous hydroxylamine solutions at 75-98 C. When varying process conditions (temperature, hydroxylamine concentration and hydroxylamine-to-powder weight ratio), cellulose nitrates analogous to a variety of colloxylin varnishes are produced. EFFECT: simplified technology and increased safety of reuse process. 3 cl, 1 tbl

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RU 2 161 633 C1

Authors

Drozdov M.A.

Gumenjuk G.Ja.

Pokrovskij A.V.

Berdonosova S.N.

Dates

2001-01-10—Published

1999-06-15—Filed

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