摘要:
Polymer particles dispersible to form a latex and latices of such polymer particles, said particles being adaptable to the fixing or bonding thereto of a biologically active substance and having a core-shell construction wherein the polymer material of the core determines the stability of the form of the latex particles and their redispersibility, and the material of the shell(1) is so hydrophilic that it would be completely or largely water soluble if it were not anchored to the core material and/or crosslinked,(2) contains functional groups which are suitable for the covalent fixation or bonding of biological active substances, and(3) in an anhydrous condition has a T.sub..lambda.max from 20.degree.-250.degree. C., depending on its composition, and methods for bonding a biologically active substance to such particles, for example to prepare a diagnostic reagent.
摘要:
What are disclosed are a method for the reinforcement of a fibrous article with an aqueous dispersion of a resin, free of formaldehyde and acrylonitrile, comprising at least 40 weight percent of alkyl acrylates and/or methacrylates having at least 4 carbon atoms in the alkyl group; up to 57 weight percent of alkyl acrylates or methacrylates having not more than 3 carbon atoms in the alkyl group, or of styrene; less than 1 weight percent of acrylic acid or of methacrylic acid; and from 3 to 15 weight percent of a hydroxyalkyl ester of an unsaturated carboxylic acid, as well as reinforced fibrous articles made by this method and distinguished by high wet strength and by low loss of the resin binder on washing with boiling water.
摘要:
What are disclosed are methods for making an aqueous dispersion of a synthetic resin copolymer, said dispersion having high pigment binding capacity and adaptable to use in the preparation of printing inks or pastes, said copolymer comprising a predominant amount of water insoluble monomers together with from 3 to 8 percent by weight of an acid component which is a water soluble acid or salt, which method comprises gradually adding said water insoluble monomers, together with a portion of said acid component, to an aqueous medium containing the balance of the acid component in the form of a dissolved water soluble salt; aqueous synthetic resin dispersions made by these methods; and printing inks comprising such an aqueous synthetic resin dispersion which has been neutralized and combined with such an amount of an organic solvent as converts the dispersion into a solution or colloidal dispersion of the synthetic resin.
摘要:
The invention provides a polymerizable composition which comprises: a) acrylates and/or methacrylates, b) 0.05% to 70% by weight of SiO2 particles having an average particle size of 1 to 30 nm which have polymerizable groups of the methacryloyl, acryloyl, styryl, itaconyl, crotonyl, vinyl, allyl and/or alkenyl type on the surface and are present in dispersion in the acrylates and/or methacrylates, at least 50% of the SiO2 particles consisting of individual, unaggregated or unagglomerated primary particles, c) not more than 2% by weight of crosslinker molecules.
摘要:
The invention relates to a polymerizable composition containing: a) acrylates and/or methacrylates which have a glass transition temperature Tg of 0° C. or less, b) from 0.5 to 70% by weight of SiO2 particles which have an average particle size of from 1 to 150 nm and have polymerizable groups on the surface and are present in dispersed form in the acrylates and/or methacrylates, with at least 50% of the SiO2 particles being individual unaggregated or unagglomerated primary particles, where the composition contains not more than 2% by weight of crosslinker molecules.
摘要:
The invention concerns crosslinked plastic particles based on polymethyl (meth)acrylate PP with a particle diameter of 1-15 .mu.m, synthesized from the monomers: A) methyl methacrylate in fractions of 20 to 99.9 wt %; B) methacrylic acid ester of formula I: ##STR1## wherein R.sub.1 stands for a C.sub.2-8 alkyl radical, a C.sub.5-6 cycloalkyl radical, a C.sub.5-6 cycloalkyl radical substituted with C.sub.1 -C.sub.4 alkyl, a C.sub.6-14 aryl radical, a substituted C.sub.6-14 aryl radical or an aralkyl radical, in fractions of 0 to 79 wt %; C) acrylic acid ester of formula II: CH.sub.2 =CH--COOR.sub.2 (II) wherein R.sub.2 stands for a C.sub.1-8 alkyl radical, a C.sub.5-6 cycloalkyl radical which can be substituted with C.sub.1 -C.sub.4 alkyl, or a perhaps substituted C.sub.6-14 aryl radical or an aralkyl radical, in fractions of 0 to 50; D) at least one crosslinking monomer CM, which is, in fact, known, containing at least two radically polymerizable groups in the molecule in fractions of 0.1 to 20 wt %, using molecular weight regulators MR, preferably so-called sulfur regulators, in fractions of 0.01 to 1 part by weight, based on the plastic particles PP.
摘要:
This invention relates to plastic containers hermetically sealed with a peelably heat-sealable plastic film comprised of a polymeric mixture comprised of 1-99 parts by weight (pbw) of an impact-resistant polystyrene resin and 99-1 pbw of a copolymer consisting essentially of:p1) 20-90 weight % methyl methacrylate, ethyl methacrylate or a mixture thereof;p2) 10-80 weight % of at least one monomer of formula (I): ##STR1## and where R.sub.1 represents an alkyl group with 3-24 C atoms; andp3) 0-10 weight %, preferably 1-8 weight %, of a monomer which is copolymerizable with and different from the monomers (p1) and (p2).
摘要:
The invention relates to a method of manufacturing monodisperse poly(meth)acrylates by the method of precipitation polymerization, comprising polymerizingi) a monomer mixture comprising at least 60 wt. % of monomer of formula I ##STR1## where R represents hydrogen or methyl; andR.sub.1 represents a C.sub.1-8 alkyl group, a C.sub.6-24 aryl group, a C.sub.1-8 alkyl substituted aryl group or an aralkyl group;ii) 0.1-10 wt. % based on the weight of the monomer mixture of a block copolymer having polystyrene components; andiii) 0.02-2 wt. % based on the weight of the monomer mixture of a percarbonic acid ester;in a halogen free solvent comprising 70 to 100 wt. % of cyclohexane.
摘要:
The invention relates to a heat-sealable plastic film PF with an at least two-stage construction ranging in thickness up to 400 micrometer, that is suitable for tightly sealing plastic containers, comprising:a) a high molecular weight or crosslinked polymer P with a molecular weight in excess of 50,000 and a glass transition point Tg of
摘要:
What is disclosed is a method for preparing carrier systems, adaptable to the covalent bonding thereto of biologically active materials, consisting of a known solid support material having a surface coated with a polymer containing functional groups suitable for covalent bonding, by coating the support material with a film-forming polymer dispersion and a non-film-forming polymer dispersion, suitably in admixture, at least one of the two polymer dispersions containing a polymer having functional groups suitable for covalent bonding with a biologically active material.