Abstract: This pressure-sensitive adhesive polymer is obtained by emulsion polymerization of the mixture of the following monomers, for a total of 100% by weight: (A) 40 to 95% by weight of at least one (meth)acrylic or vinyl monomer capable of resulting in a homopolymer which has a glass transition temperature lower than or equal to -40.degree. C.; (B) 2 to 50% by weight of at least one (meth)acrylic or vinyl monomer capable of resulting in a homopolymer which has a glass transition temperature higher than or equal to 0.degree. C.; (C) 0.5 to 6% by weight of at least one carboxylic (meth)acrylic monomer; (D) 0 to 5% by weight of at least one (meth)acrylic monomer ethoxylated with 1 to 20 moles of ethylene oxide; (E) 0.05 to 1% by weight of at least one (meth)acrylic or vinyl monomer containing a ureido group; and (F) 0 to 2% by weight of at least one acrylic or vinyl monomer carrying a sulphonate functional group, the said polymer having a glass transition temperature lower than or equal to -25.degree. C.

Abstract: High-performance overprint varnishes, well-suited for the protective coating of a wide variety of substrates, e.g., papers, cardboards and packaging materials, include a composite latex and characteristically a polyethylene wax emulsion, the composite latex comprising the copolymerizate of at least one hydrophobic monomer within an aqueous solution of a styrene/maleic anhydride resin, the styrene/maleic anhydride resin having a molecular weight ranging from 500 to 5,000 and an acid number of at most 500, and the amount by weight of the styrene/maleic anhydride resin in the copolymerizate ranging from 5% to 50%.

Abstract: The present invention comprises a curable composition comprising:(i) a blocked reactive component comprising a blocked isocyanate or a blocked isothiocyanate;(ii) a functional compound containing reactive hydrogen;(iii) a triorganotin catalyst for promoting the reaction of the blocked reactive component with the functional compound.The composition may also be admixed with water.The invention also relates to a method for curing a blocked isocyanate or blocked isothiocyanate at a temperature below about 150.degree. C. which comprises combining a triorganotin compound with the blocked reactive component and functional compound and heating at a temperature less than about 150.degree. C. to obtain a cured urethane or thiourethane.

Abstract: The invention relates to the manufacture of difluoromethane by catalytic gas-phase fluorination of methylene chloride.The operation is carried out in the presence of oxygen at a temperature of between 330 and 450.degree. C. and with a bulk or supported chromium catalyst.

Abstract: A process for the preparation of 245fa is provided, wherein 1233zd is first fluorinated to 1234ze, followed by fluorination of 1234ze to 245fa. 245fa is a known foam blowing agent and refrigerant.

Abstract: To remove the traces of chlorotrifluoroethylene (F1113) which are present in a pentafluoroethane (F125), the F125 is passed through a bed of active carbon.

Abstract: A process for preparing a metal plastic composite comprising prime coating at least a portion of a metal substrate with one or more layers of an adhesion primer powder consisting of a solid thermosetting resin using a conventional powder application technique, heating the thus coated substrate to a temperature sufficient to melt a surface coating powder to be subsequently applied, immersing the thus coated substrate into a fluidized bed of a surface coating powder for a time sufficient to give the thickness of surface coating desired.

Abstract: The invention relates to a packaging comprising a thermoplastic film based on a polymer containing polyamide blocks and polyether blocks, said polymer being permeable to water vapor, to ethylene, to CO.sub.2 and to oxygen, such that the permeability to CO.sub.2 is very much greater than the permeability to oxygen. The invention is particularly useful for making sachets in order to conserve fresh fruit, vegetables or meat.

Abstract: This invention relates to aqueous emulsions based on acrylic polymers and their use for preparing films to be used in processes of preparation of cathode ray tubes, having filming temperature between about 20.degree. and 40.degree. C. which after drying produce films which, submitted to heating in nitrogen atmosphere, have a weight loss, for films having a thickness of 1-2 mm, and for the following cycle of heating:11.degree. C./minute from 25.degree. to 375.degree. C.,5.degree. C./minute from 375.degree. to 440.degree. C.,isotherm at 440.degree. C. for 45 minutes,respectively of:from 25.degree. to 245.degree. C. lower than 15% by weightfrom 245.degree. to 375.degree. C. from 30 to 70% by weightfrom 375.degree. to 440.degree. C. of 97-99% by weightafter the isotherm at 440.degree. C. the remaining residue is lower than about 0.3% by weight, the curve gradient in the on set point ranging from 0.03 to 0.08 mg/.degree.K., and at 360.degree. C. from 0.12 to 0.30 mg/.degree.K.

Abstract: The process consists in mixing, for a period tm less than the period of polymerization, in a micromixer, a flow Fm of monomer(s) to be (co)polymerized and a flow Fa of an initiator system leading to a propagation constant kp(t) greater than or equal to 500 l mol.sup.-1 s.sup.-1 and in injecting, in a polymerization reactor, a flow Fr resulting from the mixing of the flows Fm and Fa, the concentration of monomer(s) in the flow Fr being at least 10% by weight.

Abstract: Compositions which greatly diminish, or eliminate, unpleasant smells associated with the use of underwear and diapers are described. These compositions are composed of superabsorbent polymers of the polyacrylic type and of certain boron derivatives, in particular sodium tetraborate. The sanitary articles which incorporate these compositions do not develop unpleasant smells, ammoniacal or otherwise.

Abstract: The process consists in passing the liquid to be purified and a superabsorbent, preferably of polyacrylic type, through a column, the upward speed of the liquid being chosen such that, in the column, the superabsorbent which is merely swollen is in a stationary dynamics regime, whereas the superabsorbent laden with polyvalent ions settles at the bottom of the column. Application to the treatment of the aqueous rinses of articles which have undergone a nickel-plating treatment.

Abstract: Process for the manufacture of a compound of formula (I) by reaction of at least one (meth)acrylate of formula (II) with a heterocyclic alcohol of formula (III) in the presence of sodium methoxide as catalyst, characterized in that the sodium methoxide is gradually introduced, as a solution, throughout the synthesis: ##STR1## R.sup.1 =hydrogen or methyl; A and B each independently represent a straight or branched hydrocarbon chain having from 2 to 5 carbon atoms; R.sup.2 =C.sub.1 -C.sub.4 alkyl group.

Abstract: The present invention comprises a curable composition comprising:(i) a blocked reactive component comprising a blocked isocyanate or a blocked isothiocyanate;(ii) a functional compound containing reactive hydrogen;(iii) a triorganotin catalyst for promoting the reaction of the blocked reactive component with the functional compound.The composition may also be admixed with water.

Abstract: The present invention relates to a process for the preparation of basic polyaluminium chlorosulphates. This process consists, after basification, in carrying out cooking at a temperature between 60.degree. C. and 95.degree. C. such that the cooking time is proportionately shorter than the higher cooking temperature. The polychlorosulphates obtained according to the process of the invention can be used for the treatment of drinking water, effluents and in the paper industry.

Abstract: In order to regenerate the activity of a catalyst for gas phase fluorination the spent catalyst is treated with chlorine and hydrogen fluoride, at a temperature of between 250.degree. and 450.degree. C.

Abstract: An uncatalyzed liquid phase process is provided for the preparation of oligomer free 1233zd via the fluorination of 1230za with a high molar excess of HF. The 1233zd is a known intermediate useful for preparing 245fa.

Abstract: A crosslinkable composition of a polymeric thermoplastic and/or elastomeric material which is susceptible to scorching when processed at elevated temperatures, prior to crosslinking, in the presence of a free radical initiator, is protected against such scorching by the incorporation therein of a mixture of at least one hydroquinone compound and a sulfur accelerator. This mixture may also contain at least one monomeric allylic, methacrylic, acrylic or diene type coagent. The mixture exhibits a synergistic effect resulting in improved scorch protection for peroxide cured systems when compared with the protection afforded by the components singly.

Abstract: This invention relates to a flexible metal pipe covered with an impermeable sheath of a shrinkable, preferably semicrystalline polymer or polymers, characterized in that it incorporates between the shrinkable polymer sheath and the metal pipe an intermediate elastomer layer (8), optionally vulcanized or reticulated, and/or a TPE in the form of a continuous tubular sleeve (FIG. 3) or of a tape (FIG. 4 to 6). Sheathed pipes of this type are particularly suitable for flexible pipelines, optionally with suitable supports, for carrying oil and gas.

Abstract: The invention relates to a polyol-based plasticized composition which includes a sufficient quantity of a thickening additive to obtain a viscosity at 20.degree. C. of at least 4 Pa.cndot.s. This plasticized composition can be employed for obtaining a polyurethane gel.