Abstract: A process for the preparation of polycarbonates from diphenols and/or chlorocarbonic acid esters thereof and phosgene by the two-phase boundary process wherein said polycarbonate is reacted with aryl chlorocarbonate is disclosed; the reaction products are noted for their improved ageing and hydrolysis characteristics which render them useful as thermoplastic molding compositions.
Abstract: Polycarbonate compositions comprising an aromatic polycarbonate resin wherein dispersed are calcite particulates, are particularly suitable for the preparation of films characterized by their low coefficient of static friction, high light transmission and virtual freedom from haze.
Abstract: The present invention relates to polycarbonate articles and films characterized by their antistatic properties comprising polycarbonate resin and alkali, or alkali earth, salts of specific aromatic sulfonic acids, specific aromatic phosphonic acids or aromatic partial phosphoric acid esters.
Type:
Grant
Filed:
August 19, 1982
Date of Patent:
May 22, 1984
Assignee:
Bayer Aktiengesellschaft
Inventors:
Manfred Schmidt, Joachim Wank, Eckart Reese, Dieter Freitag, Klaus Wangermann, Wolfgang Cohnen
Abstract: Polycarbonates are provided having improved critical thickness values based on an aromatic diphenol preferably bisphenol A and an aromatic diphenol thioether. By incorporating 2 up to 20 mole percent of the aromatic diphenol thioether based on the total diphenol content into the polymer, the critical thickness of the article molded from the polycarbonate is substantially improved.
Type:
Grant
Filed:
August 14, 1980
Date of Patent:
May 15, 1984
Assignee:
Mobay Chemical Corporation
Inventors:
Arthur L. Baron, Parameswar Sivaramakrishnan
Abstract: Thermoplastic molding compositions characterized by their improved impact performance and deformation under load are disclosed comprising a homogeneous, intimate blend of a polycarbonate resin and a nuclear alkylated polycarbonate resin wherein blend dispersed is a polymeric modifier.
Abstract: Polycarbonates are provided having improved critical thickness values and flame retardant characteristics based upon an aromatic diol and a halogenated thiodiphenol represented by the structural formula ##STR1## wherein X.sub.1 and X.sub.2 are halogen and "a"+"b"=1 to 8; Y.sub.1 and Y.sub.2 are alkyl groups having 1 to 4 carbon atoms; and "c"+"d"=0 to 7. By incorporating an effective amount of the aromatic halogenated thiodiphenol, based upon the total aromatic diol content, into the polymer the critical thickness and flame retardant characteristics of the polycarbonate are substantially improved, a process for the preparation of the monomer of said structural formula is likewise provided.
Abstract: Polyalkylene terephthalates containing 0.5-30% by weight of monomeric aliphatic carboxylic acid esters have a higher crystallization speed and thus allow lower mold temperatures and shorter injection cycles. The polyalkylene terephthalates generally have intrinsic viscosities in excess of about 0.4 dl/g in 1:1 phenol tetrachloroethane at 25.degree. C. and are at least about 90 mol % terephthalic acid based. The ester additive is based on aliphatic cycloaliphatic or araliphatic carboxylic acids, with sebacic and adipic being preferred, and aliphatic, cycloaliphatic or araliphatic alcohols.Faster crystallization rates can be imparted to polyalkylene terephthalates by mixing them with the ester additive and melt homogenizing the mixture.
Abstract: The present disclosure is concerned with storage stable concentrated fluid aqueous dispersions of water soluble cold dyeing fiber reactive dyes. These dispersions contain anionic or polyvinyl dispersants to provide resistance against settling or agglomeration and water soluble electrolytes to provide resistance against hydrolysis of the fiber reactive groups. The dispersions have an average particle size of less than 100 microns and in a preferred embodiment sufficient buffering agent to stabilize the pH at between about 5 and 8.
Type:
Grant
Filed:
April 21, 1982
Date of Patent:
March 6, 1984
Assignees:
Mobay Chemical Corporation, Bayer Aktiengesellschaft
Inventors:
Robert G. Hoguet, Dietmar Kalz, Thomas J. Thomas, Henry T. Whetsell, Joachim Wolff, Konrad Nonn, Karl-Heinz Wolf
Abstract: In a multiphase flow tube for drying pumpable suspensions to form solids having low residual moisture contents, the process uses brief increases in the pressure of the gas stream to prevent blockages.
Type:
Grant
Filed:
August 6, 1981
Date of Patent:
February 7, 1984
Assignee:
Bayer Aktiengesellschaft
Inventors:
Clemens Casper, Dieter Grenner, Gerd-Rudiger Klette, Edzard Tholema
Abstract: The present invention relates to polycarbonate compounds characterized in that dimeric fatty acid ester soft segments are co-condensed therein. The invention further relates to processes for preparation of these compounds and their use in films and molded articles.
Type:
Grant
Filed:
August 28, 1980
Date of Patent:
February 7, 1984
Assignee:
Bayer Aktiengesellschaft
Inventors:
Manfred Schreckenberg, Hans-Heribert Burgdorfer, Rolf Dhein, Gottfried Schneider
Abstract: The invention is directed to a thermoplastic molding composition comprising alkylated polycarbonate and a dispersed polymeric phase which composition is characterized by an improved level of impact strength.
Abstract: This invention relates to a mixture which is stable in storage in the absence of moisture and comprises the following:(a) polyurethane prepolymers containing incorporated tertiary nitrogen atoms, structural units corresponding to the following formula:--O--CH.sub.2 --C(CH.sub.3).sub.2 --CH.sub.2 --O--and terminal isocyanate groups,(b) aromatic or aliphatic orthophosphoric acid esters;(c) one or more inert solvents, and(d) optionally other auxiliaries and additives, and to the use of these mixtures as adhesives or coatings for flexible or rigid substrates.
Type:
Grant
Filed:
September 27, 1982
Date of Patent:
January 17, 1984
Assignee:
Bayer Aktiengesellschaft
Inventors:
Eberhard Konig, Rudolf Hombach, Manfred Dollhausen, Josef Pedain
Abstract: The invention is directed to copolycarbonates of thiodiphenol characterized by high melt flow rate and good mechanical properties, particularly suitable for molding at temperatures lower than 500.degree. F.
Abstract: A copolycarbonate molding composition comprising the reaction product of an aromatic diphenol, a bis(4-hydroxyphenyl)biphenyl disulfone and a carbonate source is characterized by its high glass transition temperature. A blend thereof containing an organic acid salt is characterized by its improved flame retardance.
Type:
Grant
Filed:
September 28, 1981
Date of Patent:
January 10, 1984
Assignee:
Mobay Chemical Corporation
Inventors:
Arthur L. Baron, Sivaram Krishnan, Mark W. Witman, Roger J. White
Abstract: A glass fiber reinforced polycarbonate composition having an improved level of impact strength and decreased notch sensitivity, comprising an aromatic polycarbonate, glass fibers and a polyanhydride resin which is a copolymer of .alpha.-olefin and maleic anhydride is provided.
Abstract: The present invention relates to a process for the preparation of novel isocyanato-isocyanurates by the catalytic and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane in a mole ratio of about 1:4 to 4:1, and to the products produced therefrom.The present invention also relates to the use of these products, optionally in blocked form, as the isocyanate component in polyurethane lacquers.
Type:
Grant
Filed:
August 27, 1981
Date of Patent:
December 6, 1983
Assignee:
Bayer Aktiengesellschaft
Inventors:
Peter Breidenbach, Manfred Bock, Josef Pedain, Gerhard Mennicken
Abstract: The present invention relates to a modified polyisocyanate having improved compatibility with aliphatic hydrocarbon solvents comprising the reaction product of(a) an aliphatic biuret isocyanate having the formula ##STR1## and (b) about 0.05 to 0.5 mols per equivalent of isocyanate of an aliphatic monohydroxy alcohol having at least 8 carbon atoms.
Type:
Grant
Filed:
July 10, 1981
Date of Patent:
December 6, 1983
Assignee:
Mobay Chemical Corporation
Inventors:
George A. Hudson, deceased, Helmut F. Reiff
Abstract: The present invention is directed to a thermoplastic molding composition comprising thermoplastic polyurethane and a member selected from the group consisting of polyarylphosphonate and polyarylphosphonatocarbonate which composition is characterized by its improved flame retardance.
Abstract: The present invention is directed to a process for the preparation of an isocyanate-terminated prepolymer having a content of unreacted diisocyanate of less than about 2% by weight, preferably less than about 1% by weight, based on the weight of the isocyanate-terminated prepolymer, and containing internal urethane groups based on 4,4'-diisocyanato-dicyclohexyl-methane by(a) preparing an OH-terminated prepolymer from(i) a high molecular weight polyol component, and/or(ii) a low molecular weight isocyanate-reactive component, and(iii) a polyisocyanate component comprising 4,4'-diisocyanato-dicyclohexyl-methaneat an NCO/OH equivalent ratio of about 0.5:1 to 0.9:1;(b) forming the isocyanate-terminated prepolymer by reacting the OH-terminated prepolymer with a polyisocyanate other than 4,4'-diisocyanato-dicyclohexyl-methane containing aromatically-, aliphatically- and/or cycloaliphatically-bound isocyanate groups at an NCO:OH equivalent ratio, based on the free -OH groups of component (a), of about 1.