摘要:
A process for preparing vinyl polymer beads said process comprising aqueous suspension polymerisation of olefinically unsaturated monomers using a free-radical initiator, wherein at least 20 wt % of the olefinically unsaturated monomers used is derived from at least one bio-renewable olefinically unsaturated monomer.
摘要:
The invention relates to an aqueous emulsion comprising at least a vinyl polymer, said vinyl polymer comprising: a) 45 to 99 wt % of itaconate ester monomers having formula (I), wherein R and R′ are independently an alkyl or an aryl group; b) 0.1 to 15 wt % of ionic or potentially ionic unsaturated monomers; c) 0 to 54 wt % of unsaturated monomers, different from a) and b); and 0.9 to 54.9 wt % by weight of total monomers of a chaser monomer composition added subsequently and polymerised after the polymerisation of monomers a), b) and c); wherein a)+b)+c) and the chaser monomer composition add up to 100%; and wherein the aqueous emulsion contains less than 0.5 wt % free itaconate ester monomers of formula I based on the total weight of the aqueous emulsion.
摘要:
An aqueous composition comprising: A) a crosslinkable vinyl graft copolymer comprising 30 to 85 wt % of a polymeric backbone; and 70 to 15 wt % of at least one macromonomer grafted to the polymeric backbone, where the Tg of the macromonomer is in the range of from 15 to 140° C.; where the Tg of the polymeric backbone is ≦40° C.; where the vinyl graft copolymer comprises 0.6 to 10 wt % of at least one carbonyl functional vinyl monomer; where the polymeric backbone contains ≧75% of the carbonyl functional vinyl monomers in the vinyl graft copolymer; and B) a hydrazide functional compound; where the ratio of hydrazide functional groups to carbonyl functional groups in the vinyl graft copolymer is in the range of from 0.1 to 1.5; and where the composition comprises ≦50 wt % of organic co-solvent by weight of the vinyl graft copolymer.
摘要:
An aqueous solution coating composition comprising an autoxidisable polyvinyl polymer having ≧20% of fatty acid residue by weight of polymer; Tg from −60 to +15° C.; acid value of 15 to 75 mg KOH/g, Mw from 2500 to 100000 g/mol; polydispersity ≦30, said composition having ≦25% co-solvent by weight of solids, ≧30% solids by weight of composition; said composition when in the form of a coating having a telegraphing value defined as the difference in gloss at a 20° angle of between a film cast on rough PVC and a film cast on smooth PVC of 10 gloss units.
摘要:
An aqueous composition comprising at least one vinyl graft copolymer (A) and at least one vinyl polymer (B) obtained by a process comprising steps a) polymerising at least one vinyl monomer to obtain at least one macromonomer with a Tg1>15° C.; b) polymerising at least one vinyl monomer in the presence of the macromonomer prepared in step a) to form a polymeric backbone of said vinyl graft copolymer (A); c) polymerising at least one vinyl monomer in the presence of the vinyl graft copolymer (A) prepared in step b), to form said vinyl polymer (B); and where vinyl polymer (B) has a Tg2 lower than the Tg1 of the macromonomer.
摘要:
An aqueous polymer dispersion comprising a vinyl polymer with at least two phases comprising: A) 40 to 90 wt % of a vinyl polymer A having a glass transition temperature in the range of from −50 to 30° C.; and B) 10 to 60 wt % of a vinyl polymer B having a glass transition temperature the range of from 50 to 130° C.; wherein vinyl polymer A comprises 0.1 to 10 wt % of at least one acid-functional olefinically unsaturated monomer, wherein at least 20 wt % of the monomer composition used to form vinyl polymer A and vinyl polymer B is derived from at least one bio-renewable olefinically unsaturated monomer.
摘要:
Process for preparing a macromonomer using free radical-initiated aqueous emulsion polymerisation in a polymerisation reactor of at least one olefinically unsaturated monomer, which process employs a hydrophobic Co chelate complex as a CTA, a stabilising substance(s) for the emulsion polymerisation process and a monomer feed stage MF;wherein an aqueous pre-emulsified mixture A, comprising at least part of the Co chelate(s) employed, at least part of the stabilising substance(s) employed, and (i) a non-polymerisable organic solvent(s) and/or (ii) a polymerisable monomer(s) in unpolymerised or at least partially polymerised form, is contacted in the reactor with monomer(s) of feed stage MF at the beginning of and/or during the course of feed stage MF; and wherein in mixture A the weight ratio of (i) and/or (ii) to the stabilising substance(s) is in the range of from 10/1 to 1/10.
摘要:
An aqueous composition comprising components: (A) 50 to 99 wt. % of a vinyl polymer(s) having a gradient polymeric morphology; and (B) 1 to 50 wt. % of at least one polymer not having a gradient polymeric morphology, wherein components (A) and (B) add up to 100%.
摘要:
Aqueous polymer composition suitable for coating which comprises the following components dispersed in water: (1) a combination of an acrylic polymer(s) A and an acrylic polymer(s) B where polymer(s) A has a Tg of not more than 30° C. and polymer(s) B has a Tg of at least 35° C., more preferably at least 45° C., which is at least 25° C. higher than the Tg of polymer(s) A, and wherein one or both of polymers A and B bear crosslinker functional groups capable of imparting ambient-temperature crosslinkability to component (1) in a coating formed from the composition via the formation of non-radically-formed covalent bonds; and (2) a self-dispersible, ionically stabilised polymer having olefinically unsaturated bond functionality capable of imparting radiation-curability (preferably uv-radiation curability) thereto in a coating formed from the composition.
摘要:
Aqueous crosslinkable coating composition suitable for anti-graffiti and heavy duty applications comprising: (A) an aqueous polymer emulsion comprising at least one vinyl fluoropolymer which comprises as a polymerized constituent monomer thereof (i) a fluoromonomer(s) having the formula (1) wherein R1 is CH3 or H, R2 is a per-fluorinated C1-5 alkyl group and n is 1, 2, 3 or 4, (ii) a hydroxyl functional monomer(s) and (iii) a carboxylic acid-functional monomer(s) where the vinyl fluoropolymer has a glass transition temperature Tg within the range of from −50 to 90° C. and (B) at least one hydroxyl-reactive crosslinker material