摘要:
The invention relates to mouldings comprising a transparent plastic matrix with small proportions of incorporated, very finely divided plastic particles which have a particle diameter less than the wavelength of visible light, and to the use of these mouldings for visualizing laser beams and for illumination purposes.A refractive index difference between the core of the scattering particles B and the matrix plastic A in the range 0.09-0.3 and a good distribution of the plastic particles B in the matrix are important for high transparency of the mouldings according to the invention in combination with good visualization of laser beams.The plastic particles B are core-shell particles, as are readily obtainable by emulsion polymerization (cf. for example DE 198 20 302).
摘要:
The invention describes polyesters containing (meth)acrylate end groups, of the general formula (I) CH2═CRCOO—PE—OCOCR═CH2 where R=CH3 or H, where PE=[—A—OCO—B—COO—]m—A—, [—CHR′—COO—]n—A—[—OCOCHR′—]n, or combinations thereof, in which A is an alkylidene radical having 2-20 carbon atoms or an alkoxylidene radical having 2-1000, preferably 2-500, alkoxylidene units, B is a saturated alkylidene radical having 2-10 carbon atoms, R′ is H or CH3, m is 1-100, n is 1-100, and, if both m and n are present, the sum m+n is 2-200, where the polyesters containing (meth)acrylate end groups are characterized in that a) the content of short-chain di(meth)acrylates (II) CH2═CRCOO—A—OCOCR═CH2 is
摘要:
The invention relates to a method for the production of poly(meth) acrylate particles with a particle diameter of 1-15 .mu.m, where the monomers M are polymerized according to the method of batch polymerization, with 20-50 parts by weight of monomer M in a liquid medium LM, consisting of 55-100% by weight of mineral oil, and with the addition of 0.1 to 5 parts by weight of a polymer emulsifier E and 0.05-5 parts by weight of a radical initiator.
摘要:
The invention relates to transparent composite plate systems of a) at least two acrylic glass exterior plates S, S' with a thickness of at least 2 mm and parallel surfaces, and b) an intermediate layer Z containing a thermoplastically processable elastomer E, whereby the elastomer E contains from 60-100% by weight of a comb polymer KP, which itself contains from 50 to 5% by weight of at least one polymethyl methacrylate macromonomer of Formula I ##STR1## and from 95 to 50% by weight of alkyl acrylates of Formula II ##STR2## wherein R and R.sub.4 are defined in the claims.
摘要:
Thermoplastically processible elastomers based on acrylates, which contain 40-100 wt. % of one or more comb polymers having a molecular weight greater than 50,000 Dalton, comprised of:(A) 5-50 wt. % of macromonomers comprised of methyl methacrylate or copolymers of methyl methacrylate with comonomers chosen from other (meth)acrylic acid esters and styrenes;containing a terminal unit with a radically polymerizable group and having a glass transition temperature (Tg) of at least 60.degree. C., a molecular weight in the range 500-100,000 Dalton, and an index of refraction in the range n.sub.D =1.48-1.50;(B) 5-90 wt. %, based on the total weight of the comb polymer, of monomers or monomer mixtures of formula I: ##STR1## where R.sub.1 is a C.sub.1 -C.sub.12 -alkyl group; and (C) 5-50 wt. % based on the total weight of the comb polymer, of a phenyl group-containing radically polymerizable monomer.
摘要:
Compatible polymer blends PM, exhibiting a single glass transition temperature Tg comprise(A) 0.1-99.9 wt. % of a polymer P1 comprising at least 95 wt. % styrene; and(B) 99.9-0.1 wt % of a polymer P2 comprising(a) more than 90 wt. % and up to 100 wt. % of ethyl methacrylate, and(b) 0 wt. % up to less than 10 wt. % of at least one monomer copolymerizable with ethyl methacrylate, provided that (a) plus (b) add up to 100 wt. %.The compatible polymer blends may be formulated with another polymer P3, chemically differentiable from P1 and P2, with P3 being incompatible with P1, P2 and PM, to form compositions of better impact resistance than PM. The compatible polymer blends find use in the production of weather-resistant items; data-storage discs, especially for optically readable information; and optical gradient fibers.
摘要:
The invention relates to light-scattering polystyrene molding compounds comprising40-99.9 weight % of a (optionally impact-strength-modified) polymeric matrix phase comprised of at least 50 weight % styrene and or substituted styrenes, or a mixture thereof; and0.1-60 weight % of scattering bodies comprising a copolymer comprised of:p1) 20-89.5 parts by weight (pbw) methyl methacrylate, ethyl methacrylate, or a mixture thereof;p2) 10-80 pbw of at least one monomer of formula (I) ##STR1## where R.sub.1 represents a C.sub.3-24 alkyl group; and p3) 0.5-10 pbw of at least one crosslinking monomer with two or more ethylenically unsaturated, radically polymerizable groups; andp4) 0-10 pbw of additional ethylenically unsaturated monomers which are radically copolymerizable with (p1), (p2), and (p3); wherein the sum of the amounts of the monomers (p1), (p2), (p3), and (p4) is 100 pbw.
摘要:
This invention relates to heat-sealable plastic films PF with at least two-phased structure in the thickness range up to 400 .mu.m that are suitable for tightly sealing plastic comprisinga) a high molecular weight or crosslinked polymer P with a molecular weight Mw greater than 50,000 and a glass transition temperature Tg below 10.degree. C.; andb) a copolymer CP with a glass transition temperature Tg above 20.degree. C. made up of.alpha.) 0-85 wt. % methyl methacrylate.beta.) 0-100 wt. ethyl methacrylate.gamma.) 0-100 wt. cyclohexyl methacrylate, cyclopentyl methacrylate, or a mixture thereof;.delta.) 0-20 wt. % of a monomer copolymerizable with the monomers .alpha.)-.gamma.), and different from them, provided that the sum of the components .alpha.) to .delta.) is 100 wt. %wherein at least 2 wt. % of copolymer CP is covalently bound to polymer P.
摘要:
Modified rubber compositions comprise by weight about 15-60% of a highly saturated aliphatic rubber such as ethylene-propylene-diene rubber, about 25-80% of acrylate monomer units; and less than about 5% multi-functional monomer units. The compositions exist as amorphous heterogeneously dispersed phases. The first phase comprises the copolymer rubber to which polymers of at least 10% of the other monomer units are grafted. The second phase comprises the other monomers polymerized as homo and copolymers, not grafted to the rubber. Optionally, up to 20% of the composition comprises high index monomer units. The high index monomer units may be copolymerized with the acrylate and grafted to the rubber. Greater than 10% of the monomer units other than rubber are grafted to the rubber. The number average molecular weight of the grafts is between 10,000 and 80,000 daltons. About 2-20% by weight of one or more polymers may be provided to adjust the refractive indices of the rubber or the polyacrylate phase in the final product such that when the composition is present at the 10% rubber level, the haze can be reduced to less than 20%.