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US4421895A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the manufacture of ABS polymers and use thereof in preparation of molded parts

Assignee: BASF SE
•
Filing: 1981-12-10
•
Granted: 1983-12-20
•
Expires: 2001-12-10
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Abstract

Abstract A process for making ABS polymer particles comprising continuous polymerization of a mixture of at least one of each of (a) an aromatic vinyl monomer, and (b) an ethylenically unsaturated monomer in a weight ratio of (a):(b) of 90:10 to 10:90 in the presence of at least one of each of (c) a rubber-like polymer in an amount of 3 to 35 percent by weight relative to the total weight of the monomers (a) and (b), (d) a solvent, (e) a radical initiator and (f) an optional chain transfer agent. The process is carried out at temperatures between 80° C. to 180° C. in two or more reaction zones while the reaction mixture is stirred and while the monomers and solvents are removed in a degassing zone. The rubber-like polymer (c) has a solution viscosity of less than 80 mPa.s and a ratio of the solution viscosity of (c) to a percent of solvent expressed by 100[(d)/(a+b+c+d)] equal to or less than 2.5 mPa.s/percent of solvent.

Inventors

  • 👤 Adolf Echte
  • 👤 Hermann Gausepohl
  • 👤 Karl Gerberding

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 11:40
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02; C08F279/00; C08F279/02; C08F279/04; C08F287/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 174 words
A process for the manufacture of acrylonitrile butadiene styrene polymer particles which comprises continually polymerizing a mixture of (a) styrene and (b) acrylonitrile, in a ratio of (a):(b) between 90:10 and 10:90 in the presence of (c) 3 to 35 percent by weight, relative to the weight of (a) and (b), of a styrene-butadiene block copolymer of solution viscosity, measured in a 5 percent by weight solution in styrene at 25° C., of equal to or less than 80 mPa.s, (d) a solvent selected from the group consisting of methylethyl ketone,toluene and ethylbenzene, wherein the ratio of the percent of solvent, expressed by 100[d/(a+b+c+d)] to the solution viscosity of (c) is greater than 0.4, (e) from 0.02 to 0.5 percent by weight, relative to the weight of (a) and (b), of a radical initiator selected from the group consisting of t-butyl peroxybenzoate, t-butyl peroctoate and dibenzoyl peroxide, at a temperature from 80° C. to 180° C. in two or more reaction zones; with stirring and removal of monomers and solvent in a degassing zone.
Claim 2
Dependent Claim 174 words
A process for the manufacture of acrylonitrile butadiene styrene polymer particles which comprises continually polymerizing a mixture of (a) styrene and (b) acrylonitrile, in a ratio of (a):(b) between 90:10 and 10:90 in the presence of (c) 3 to 35 percent by weight, relative to the weight of (a) and (b), of a styrene-butadiene block copolymer of solution viscosity, measured in a 5 percent by weight solution in styrene at 25° C., of equal to or less than 80 mPa.s, (d) a solvent selected from the group consisting of methylethyl ketone,toluene and ethylbenzene, wherein the ratio of the percent of solvent, expressed by 100[d/(a+b+c+d)] to the solution viscosity of (c) is greater than 0.4, (e) from 0.02 to 0.5 percent by weight, relative to the weight of (a) and (b), of a radical initiator selected from the group consisting of t-butyl peroxybenzoate, t-butyl peroctoate and dibenzoyl peroxide, at a temperature from 80° C. to 180° C. in two or more reaction zones; with stirring and removal of monomers and solvent in a degassing zone.
Claim 3
Dependent Claim 28 words
The process of claim 1 which additionally comprises (f) from 0.01 to 0.3 percent by weight relative to the weight of monomers (a) and (b) of a mercaptan.
Claim 4
Dependent Claim 26 words
The process of claim 2 wherein the mercaptan is selected from the group consisting of n-butyl mercaptan, n-octyl mercaptan, n-n dodecyl mercaptan and tertiary dodecyl mercaptan.

References Cited (Backward Citations)

US3945976A Cited
US3904709A Cited
US3859388A Cited
US4282334A Cited
US4255315A Cited
US4315083A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-12-19 1987-06-20 1987-12-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-12-19 1991-06-20 1991-12-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-12-19 1995-06-20 1995-12-20 $7700.00 Window Closed / Lapsed

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