EP0125574A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flame-retardant acrylic fibers and process for preparing same
Assignee: Kanegafuchi Chemical Industry Co Ltd
•
Filing: 1984-05-04
•
Granted: —
•
Expires: 2004-05-04
Abstract
Abstract The present invention discloses a flame-retardent acrylic synthetic fiber comprising acrylonitrile and a vinyl monomer copolymerizable therewith and containing a finely divided inorganic tin compound. The fiber has high flame retardancy, outstanding gloss and transparency, and satisfactory whiteness and dyeability.
Inventors
- 👤 Takahiro Myodani Tsutsujigaka Village 3-202 Ogawa
- 👤 Masahiko Takada
- 👤 Takaharu Matsumoto
- 👤 Youichi Kanbara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 20:23
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/40; C; C08; C08K; C08K3/00; C08K3/10; C08K3/11; D01F1/00; D01F1/02; D01F1/07
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
A flame-retardant acrylic fiber characterized in that the fiber is prepared from a polymer comprising acrylonitrile and a vinyl monomer copolymerizable therewith, the fiber containing an inorganic tin compound having an average particle size of up to 100 mp.
Claim 2
Dependent Claim
39 words
A flame-retardant acrylic fiber characterized in that the fiber is prepared from a polymer comprising acrylonitrile and a vinyl monomer copolymerizable therewith, the fiber containing an inorganic tin compound having an average particle size of up to 100 mp.
Claim 3
Dependent Claim
24 words
A flame-retardant acrylic fiber as defined in claim 1 wherein the inorganic tin compound has an average particle size of up to 50 mp.
Claim 4
Dependent Claim
46 words
A flame-retardant acrylic fiber as defined in claim 1 or 2 wherein the polymer comprises 30 to 70% by weight of acrylonitrile, 70 to 30% by weight of a halogen-containing vinyl monomer and 0 to 10% by weight of a vinyl monomer copolymerizable with said components.
Claim 5
Dependent Claim
34 words
- 4. A flame-retardant acrylic fiber as defined in claim 1 or 2 which contains the inorganic tin compound in an amount of 0.1 to 8% by weight in terms of metallic tin content.
Claim 6
Dependent Claim
69 words
A flame-retardant acrylic fiber as defined in claim 1 which is prepared by admixing a tin compound with the reaction mixture obtained by subjecting acrylonitrile and a vinyl monomer copolymerizable therewith to polymerization in an aqueous system, thereafter separating the polymer from the aqueous system along with the tin compound, purifying the separated mixture, mixing the resulting product with a solvent for the polymer and spinning the resulting mixture.
Claim 7
Dependent Claim
56 words
A flame-retardant acrylic fiber as defined in claim 5 wherein the tin compound is a water-soluble tin compound which becomes a gel-like precipitate or colloidal fine particles when treated with an acid or alkali for pH adjustment or reaction or when diluted or reacted with water, or is a reaction product of the water-soluble tin compound.
Claim 8
Dependent Claim
17 words
A flame-retardant acrylic fiber as defined in . claim 5 wherein the aqueous-system polymerization is emulsion polymerization.
Claim 9
Dependent Claim
70 words
A process for preparing an acrylic synthetic fiber characterized by admixing a tin compound with the -reaction mixture obtained by subjecting acrylonitrile and a vinyl monomer copolymerizable therewith to polymerization in an aqueous system, thereafter separating the polymer from the aqueous system along with the compound or a reaction product thereof, purifying the separated mixture, mixing the resulting product with a solvent for the polymer and spinning the resulting mixture.
Claim 10
Dependent Claim
70 words
A process for preparing an acrylic synthetic fiber characterized by admixing a tin compound with the -reaction mixture obtained by subjecting acrylonitrile and a vinyl monomer copolymerizable therewith to polymerization in an aqueous system, thereafter separating the polymer from the aqueous system along with the compound or a reaction product thereof, purifying the separated mixture, mixing the resulting product with a solvent for the polymer and spinning the resulting mixture.
Claim 11
Dependent Claim
43 words
A process as defined in claim 8 wherein the tin compound is a.water-soluble tin compound which becomes a gel-like precipitate or colloidal fine particles when treated with an acid or alkali for pH adjustment or reaction or when diluted or reacted with water.
Claim 12
Dependent Claim
42 words
A process as defined in claim 8 wherein the polymer comprises 30 to 70% by weight of acrylonitrile, 70 to 30% by weight of a halogen-containing vinyl monomer and 0 to 10% by weight of a vinyl monomer copolymerizable with these components.
Claim 13
Dependent Claim
26 words
A process as defined in claim 8 or 10 wherein at least one of the copolymerizable vinyl monomers is a vinyl monomer containing a sulfonic group.
Claim 14
Dependent Claim
14 words
A process as defined in claim 8 wherein the aqueous-system polymerization is emulsion polymerization.
Claim 15
Dependent Claim
38 words
A process as defined in claim 8 or 9 wherein the tin compound is admixed with the reaction mixture in an amount of 0.1 to 8% by weight in terms of metallic tin content based on the polymer.
Claim 16
Dependent Claim
25 words
A process as defined in claim 8 wherein the separating step is performed after adjusting the aqueous system to a pH of 3 to 7.
Claim 17
Dependent Claim
19 words
A process as defined in claim 8, 9 or 13 wherein the tin compound is an inorganic tin compound.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.