Low molecular weight polymers of acrylic esters
First Claim
1. A low molecular weight polymer of one or more acrylic esters, obtainable by subjecting(a) from 80 to 100% by weight of at least one acrylic ester of C1 -C8 -alkanol (monomer I) and(b) 0 to 20% by weight of one or more other copolymerizable monomers (monomer II)to a free radical polymerization in a solution in isopropanol in a pressure vessel at 130°
- -140°
C. by introducing first from 70 to 95% by weight of a solvent and adding the remainder of the polymerization batch continuously over 3-7 hours in separate portions of which one contains the monomers and, after the polymerization has ended, distilling off the solvent under reduced pressure, the weight proportion of solvent being 5-15% by weight based on the monomers, the weight proportion of initiator being 0.5-3% by weight based on the monomers, and the half-life of the initiator at the polymerization temperature being from 10 seconds to 3 hours.
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Accused Products
Abstract
Low molecular weight polymers of acrylic esters which are suitable for use as external plasticizers in coated compositions on a synthetic resin basis are obtainable by subjecting
(a) from 80 to 100% by weight of at least one acrylic ester of C1 -C8 -alkanol (monomer I) and
(b) 0 to 20% by weight of one or more other copolymerizable monomers (monomer II)
to a free radical polymerization in a solution in isopropanol in a pressure vessel at 130°-140° C. by introducing first from 70 to 95% by weight of a solvent and adding the remainder of the polymerization batch continuously over 3-7 hours in separate portions of which one contains the monomers and, after the polymerization has ended, distilling off the solvent under reduced pressure, the weight proportion of solvent being 5-15% by weight based on the monomers, the weight proportion of initiator being 0.5-3% by weight based on the monomers, and the half-life of the initiator at the polymerization temperature being from 10 seconds to 3 hours.
4 Citations
1 Claim
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1. A low molecular weight polymer of one or more acrylic esters, obtainable by subjecting
(a) from 80 to 100% by weight of at least one acrylic ester of C1 -C8 -alkanol (monomer I) and (b) 0 to 20% by weight of one or more other copolymerizable monomers (monomer II) to a free radical polymerization in a solution in isopropanol in a pressure vessel at 130° - -140°
C. by introducing first from 70 to 95% by weight of a solvent and adding the remainder of the polymerization batch continuously over 3-7 hours in separate portions of which one contains the monomers and, after the polymerization has ended, distilling off the solvent under reduced pressure, the weight proportion of solvent being 5-15% by weight based on the monomers, the weight proportion of initiator being 0.5-3% by weight based on the monomers, and the half-life of the initiator at the polymerization temperature being from 10 seconds to 3 hours.
- -140°
Specification
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- Resources
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Current AssigneeBASF AG (BASF SE)
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Original AssigneeBASF AG (BASF SE)
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InventorsBobar, Georg, Schroeder, Gerd, Schnell, Klaus, Wistuba, Eckehardt
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Primary Examiner(s)Killos, Paul J.
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Application NumberUS07/461,744Time in Patent Office365 DaysField of Search560/190, 560/205US Class Current560/190CPC Class CodesC08F 20/12 of monohydric alcohols or p...
