Abstract:
The invention relates to a method for producing a polymer dispersion by copolymerisation of 20 - 70 weight parts of a monomer mixture comprising c) 2.5 - 100 wt. % of one or more (meth) acrylic acid esters of monovalent, saturated C3-C8 alcohols as monomers A, and 0 - 97.5 wt. % of one or more other ethylenlically unsaturated monomers as monomers B in 100 weight parts of an aqueous solution which contains 5 - 35 wt.- % of a starch or a starch derivative, in emulsion polymerisation in the presence of an initiator containing peroxide groups, whereby the initiator and monomer can be continually dosed. In a first supply period of 5 - 60 minutes a first amount of an initiator is dosed and in a second supply period of 15 - 180 minutes a second amount of an initiator is dosed. The first amount of initiator is greater than the second amount of initiator.
Abstract:
This disclosure describes a processing approach for the rapid and efficient in-situ polymerization of specially prepared precursor mixtures to achieve near-net-shape production of objects/articles with exact dimensions. The process relies on the use of polymerizable compositions comprised of a mixture of a reactive plasticizer and an initiator, optionally also including a dead polymer, which compositions are semi-solid-like and induce little shrinkage upon curing as a result of their partially polymerized nature prior to processing. The articles of the invention have a surface and an interior core, the composition of the surface material being distinct from the composition of the core material while at the same time the surface and the core are an integral, monolithic entity. In addition, the articles are dimensionally stable and exhibit high fidelity replication.
Abstract:
A water-soluble cellulose derivative which is produced by grafting 2-methacryloyloxyethylphosphorylcholine onto water-soluble cellulose and has a structural unit represented by formula (I); and a biocompatible material containing the same as the active ingredient, wherein n represents an integer of 1 to 100. The water-soluble cellulose derivative having such a specific structural unit is endowed with both biocompatibility and an affinity for cellulose, thus being utilizable as a biocompatible material for clarifying blood, and so forth.
Abstract:
The present invention relates to plastic packaging materials and processes that facilitate recycling of PET (polyethylene terephthalate) containers e.g PET bottles and crystallizable clear PET-g (glycol-modified polyethylene terephthalate) labels such as heat shrinking sleeve labels. Disclosed herein is a clear primer coating for recyclable PET-g shrink-sleeve labels, curable upon exposure to UV light, which is excellent in adhesion, steam-resistance and overprint ability, and which promotes the de-inking of subsequent coloured ink layers under relatively mild caustic wash conditions. Methods of utilizing such a primer coating within flexographic printing processes are also encompassed within the invention.
Abstract:
Biodegradable graft copolymers derived from a carbohydrate, including nitrogen- containing carbohydrates and modified carbohydrates, and at least one α,β-unsaturated carboxylic acid derivative having superabsorbent properties are disclosed in addition to the substantially adiabatic polymerization process by which the graft copolymers are made. The methods disclosed can be carried out in a variety of currently available stirred and/or continuous commercial reactors. Polymerizations carried out with starch have surprisingly produced substantially quantitative yields of graft copolymer free of residual monomer produced as a moist copolymer. Product work-up typically involves an optional neutralization and drying.