Patent application number | Description | Published |
20090124723 | PROCESS FOR THE MODIFICATION OF BIODEGRADABLE POLYMERS - Process for the modification of a polymer or copolymer having the following general structure for one or more of the repeating units: (1) wherein n is an integer, m is an integer in the range 0 to 6, and R is selected from hydrogen, substituted or unsubstituted C | 05-14-2009 |
20100240782 | PROCESS FOR PREPARING STYRENE-BASED (CO)POLYMERS - A process for preparing a styrene-based (co)polymer comprising the steps of: a) preparing a monomer composition comprising styrene monomer and optionally one or more co-monomers and b) polymerising the monomer composition in the presence of an initiator mixture containing (i) 55-95 wt % of at least one polyfunctional initiator having a 1-hour half-life temperature in the range of 70-110° C. and (ii) 5-45 wt % of at least one monofunctional initiator having a 1-hour half-life temperature in the range of 70-110° C., so as to form the styrene-based (co)polymer. | 09-23-2010 |
20110104812 | PROCESS FOR TREATING POLYMERS CONTAINING RESIDUAL CATALYST - Process for thermally stabilizing a polymer containing residues of a Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), or Ge(II)-containing catalyst by treating the polymer at a temperature above its melting temperature with a peroxide selected from the group consisting of ketone peroxides, hydroperoxides, peracids, hydrogen peroxide, and mixtures thereof, wherein said peroxide is used in an amount less than 0.2 wt % based on the weight of the polymer and wherein the molar ratio of peroxy functionalities from said peroxide (p) to metal (M) ranges from 1 to 100; said metal (M) being selected from the group consisting of Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), and Ge(II). The invention further relates to a method for determining the metal residue content of a polymer. | 05-05-2011 |
20110152412 | FLAME RETARDANT POLYOLEFIN COMPOSITION - Composition comprising at least one polyolefin, a brominated flame retardant, a free radical initiator, and more than 0.1 phr to not more than 0.5 phr of a synergist selected from the group consisting of antimony compounds, tin compounds, molybdenum compounds, zirconium compounds, boron compounds, zinc compounds, and mixtures thereof. This composition has very good flame retardancy with only very low amounts of synergist. | 06-23-2011 |
20110160363 | FLAME RETARDANT POLYOLEFIN COMPOSITION - Composition comprising at least one polyolefin, tris-dibromopropyl isocyanurate, and 0.05-2 phr of at least one free radical initiator, said initiator being selected from the group consisting of organic peroxides, C—C initiators, and N—N initiators. This composition makes it possible to obtain very good flame retardancy with much lower amounts of synergist than known compositions. What is more, a synergist is not even required to obtain sufficient flame retardancy. | 06-30-2011 |
20120245315 | PROCESS FOR THE POLYMERIZATION OF STYRENE - A process for the suspension polymerization of styrene monomer to produce polystyrene comprising the steps of (a) heating a polymerization suspension comprising the styrene monomer to a temperature of at least 60° C., (b) dosing an initiator to said heated polymerization suspension during the polymerization reaction over a period of more than 90 minutes to less than 5 hours, in a continuous manner or intermittently in at least 2 portions, said period starting at a monomer conversion of 65% of less and said initiator having a half-life at the temperature at which it is dosed of not more than 60 minutes, wherein a brominated flame retardant is present in the polymerization suspension during the polymerization reaction. | 09-27-2012 |