摘要:
Radiation-curable acrylates are prepared by a process in which, in a 1st stage, a hydroxy compound is reacted with acrylic acid or methacrylic acid and, in or before a 2nd stage, the reaction product of the 1st stage is then reacted with an epoxy compound and compounds having one or more primary or secondary amino groups are added in the 2nd stage and the reaction in the 2nd stage is continued, after the addition of these compounds, until the acid number of the reaction mixture has decreased by at least 3 mg KOH/g of reaction mixture from the time of the addition of these compounds.
摘要:
Radiation-curable acrylates are prepared by a process in which the hydroxy compound is reacted with acrylic acid or methacrylic acid in a first stage and, in a second stage, the reaction product of the first stage is reacted with an epoxide compound in the presence of, as a catalyst, a quaternary ammonium or phosphonium compound of the general formula ##STR1## where X.sup.- is an opposite ion and R.sup.1 to R.sup.4 independently of one another are each C.sub.1 -C.sub.18 -alkyl which may be substituted by one or two phenyl groups or are each C.sub.6 -C.sub.12 -aryl which may be substituted by one or two C.sub.1 -C.sub.6 -alkyl groups.
摘要:
Urethane(meth)acrylates are obtainable bya) reacting polyether(meth)acrylates or polyester(meth)acrylates, which may also have at least one free hydroxyl group, with primary or secondary amino compounds which have at least one hydroxyl group, so that from 0.5 to 60 mol % of the (meth)acrylate groups are present in the form of Michael adducts with the amino compounds, andb) subsequently reacting the product obtained in a) with isocyanates.
摘要:
Urethane(meth)acrylates are obtainable by a) reacting polyether(meth)acrylates or polyester(meth)acrylates, which may also have at least one free hydroxyl group, with primary or secondary amino compounds which have at least one hydroxyl group, so that from 0.5 to 60 mol % of the (meth)acrylate groups are present in the form of Michael adducts with the amino compounds, and b) subsequently reacting the product obtained in a) with isocyanates.
摘要:
Radiation-curable binders which are obtained by reactingA) an amine/formaldehyde condensate having a molar ratio of formaldehyde to amino groups of from 1:1 to 2:1 withB) one or more esters, having a free hydroxyl group, of acrylic acid or of methacrylic acid with polyalcohols which contain from two to four alcoholic hydroxyl groups, from 0.1 to 0.3 hydroxyl equivalent of component B) being used per methylol equivalent of component A),in the presence of a strong acid are suitable for use in coating materials.
摘要:
Described are aqueous, radiation-curable coating compositions comprising:a) from 5.0 to 90.0% by weight of at least one water-dispersible polymer P comprising at least one .alpha.,.beta.-ethylenically unsaturated, radiation-polymerizable double bond,b) from 0.1 to 90% by weight of at least one radiation-curable compound S which is different from P and which is soluble in water or is dilutable with at least 10% by weight of water, based on the overall weight of the coating composition, and which comprises at least one .alpha.,.beta.-ethylenically unsaturated, radiation-polymerizable double bond,c) from 0 to 20% by weight of a photoinitiator,d) from 0 to 60% by weight of a filler,e) from 0 to 20% by weight of further additives,f) water to 100% by weight and their use.
摘要:
In a process for improving the adhesive strength of radiation-cured films of acrylate resins which comprise compounds having at least one amine group and at least one unsaturated acrylate group and, in particular, an amino-modified acrylate resin having a molecular weight Mn of at least 300, on substrates, the acrylate resins are admixed with amine-hardenable polyepoxides having an epoxide value of from 1 to 15 mol/kg such as polyglycidyl esters or polyglycidyl ethers. Preferred curable mixtures of amine-modified acrylate resins with polyepoxides have amine numbers of from 1 to 250 mg KOH/g and epoxide values of from 0.1 to 4 mol/kg. The mixtures applied as coating films to metal substrates or plastics substrates, in particular, are radiation-cured with, e.g., UV light and an at least partial amine hardening of the polyepoxide compounds in the mixture is conducted by thermal conditioning at, e.g., from 50 to 120° C.
摘要:
A mixture comprisinga condensation resin A) constructed from urea or urea derivatives a.sub.1) and ketones or aldehydes a.sub.2) selected from acidic-CH aldehydes or ketones and their mixtures with formaldehyde, anda radiation-curable compound B) having at least 2 acryloyl or methacryloyl groups is useful in offset printing.
摘要:
Aqueous dispersions containA) from 20 to 90% by weight of a dispersed polymer having a glass transition temperature above 30.degree. C. andB) from 10 to 80% by weight of a tri-, tetra-, penta-or hexa(meth)acrylate of an alkoxylated, trivalent to hexavalent alcohol having a mean degree of alkoxylation of the hydroxyl groups of the alcohol, defined as the quotient of the number of alkoxy groups to the number of hydroxyl groups, ie. the functionality of the alcohol prior to the alkoxylation, of at least 0.5,the stated weights being based on the sum of A) and B).
摘要:
A photoinitiator mixture comprising a) at least one acyl- or diacylphosphine oxide of the formula I and b) at least one benzophenone derivative of the formula