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    LOW TEMPERATURE, PRESSURELESS SINTERING OF SILICON NITRIDE
    91.
    发明申请
    LOW TEMPERATURE, PRESSURELESS SINTERING OF SILICON NITRIDE 审中-公开
    低温，无氧烧结氮化硅

    公开(公告)号：WO1995017356A1

    公开(公告)日：1995-06-29

    申请号：PCT/US1994010034

    申请日：1994-09-07

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  NILSEN, Kevin, J.

    IPC: C04B35/584

    CPC classification number: C04B35/584

    Abstract: A silicon nitride-based powder composition that yields sintered bodies having a density of at least 3.15g/cm by pressureless sintering. The composition includes silicon nitride and an amount of bismuth oxide as a phase transition aid in addition to magnesium oxide, aluminium oxide, zirconium oxide and, optionally, silicon dioxide. The sintered bodies can be produced at temperatures of 1650 DEG C or less.

    Abstract translation: 一种氮化硅基粉末组合物，其通过无压烧结产生密度至少为3.15g / cm 3的烧结体。 除了氧化镁，氧化铝，氧化锆和任选的二氧化硅之外，组合物包括氮化硅和一定量的作为相转移助剂的氧化铋。 烧结体可以在1650℃以下的温度下制造。

    PREPARATION OF 4,4'-DIHYDROXY-ALPHA-ALKYLSTILBENES AND 4,4'-DIHYDROXY-ALPHA, ALPHA'-DIALKYLSTILBENES
    93.
    发明申请
    PREPARATION OF 4,4'-DIHYDROXY-ALPHA-ALKYLSTILBENES AND 4,4'-DIHYDROXY-ALPHA, ALPHA'-DIALKYLSTILBENES 审中-公开
    4,4'-二羟基-AlPHA-ALKYLSTILBENES的制备和4,4'-二羟基-AlPHA，ALPHA-二烷基

    公开(公告)号：WO1995015301A1

    公开(公告)日：1995-06-08

    申请号：PCT/US1994013480

    申请日：1994-11-21

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  HEFNER, Robert, E., Jr. ,  VILLARREAL, Maria, I. ,  CARR, David, A.

    IPC: C07C37/20

    CPC classification number: C07C39/215 ,  C07C37/20

    Abstract: 4,4'-Dihydroxy-alpha-alkylstilbenes of high purity were prepared by reacting at a temperature of from -20 DEG C to 20 DEG C a mixture of: (1) at least one alpha-haloketone; (2) at least one phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound; and (3) at least one strong protonic acid or Lewis acid, such that the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound: alpha-haloketone(s) is from 0.1:1 to 1.9:1, and the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound: alpha-haloketone(s):strong protonic acid or Lewis acid is from 0.1:1:0.0026 to 1.9:1:0.95. The high purity 4,4'-dihydroxy-alpha-alkylstilbenes are useful for the advancement of epoxy resins, for the preparation of phenoxy resins and for the preparation of epoxy resins.

    Abstract translation: 通过在-20℃至20℃的温度下使下列混合物反应制备高纯度的4,4'-二羟基-α-烷基二苯乙烯：（1）至少一种α-卤代酮; （2）至少一种含酚羟基的化合物或含烷氧基的芳族化合物; 和（3）至少一种强质子酸或路易斯酸，使得含酚羟基的化合物或含烷氧基的芳族化合物：α-卤代酮的摩尔比为0.1:1至1.9:1，并且 含酚羟基化合物或含烷氧基的芳族化合物：α-卤代酮：强质子酸或路易斯酸的摩尔比为0.1：1：0.0026至1.9：1：0.95。 高纯度4,4'-二羟基-α-烷基芪可用于环氧树脂的前进，苯氧基树脂的制备和环氧树脂的制备。

    METHOD TO INCREASE THE LEVEL OF 'alpha'-GLYCOL IN LIQUID EPOXY RESIN
    96.
    发明申请
    METHOD TO INCREASE THE LEVEL OF 'alpha'-GLYCOL IN LIQUID EPOXY RESIN 审中-公开
    增加液体环氧树脂中α-甘露醇含量的方法

    公开(公告)号：WO1995011266A1

    公开(公告)日：1995-04-27

    申请号：PCT/US1994001502

    申请日：1994-02-14

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  HAIRSTON, Thomas, J.

    IPC: C08G59/14

    CPC classification number: C08G59/1427

    Abstract: The performance of expoxy resins in several end-uses is enhanced by the presence of small quantities of hydrolyzed resin terminated by alpha -glycol groups. The invention is a process in which a mixture that contains liquid epoxy resin and water is reacted at elevated temperatures in order to hydrolyze epoxy groups into alpha -glycol groups, characterized in that: (1) the reaction temperature is between 130 DEG C and 200 DEG C; (2) the reaction mixture contains between 0.5 and 10 parts water per 100 parts resin by weight; and (3) the mixture contains 0 to 1 weight percent organic solvents and 0 to 100 ppm each of: organic acids, organic diacids, phosphonium compounds, and alkali or alkaline earth metals and their salts. The process raises the level of alpha -glycol groups in the resin, but uses no solvents or catalysts, so that it is easy to clean up the resulting resin.

    Abstract translation: 通过存在少量由α-二醇基团封端的水解树脂，可以增强多种最终用途中的环氧树脂的性能。 本发明是一种将含有液体环氧树脂和水的混合物在升高的温度下反应以将环氧基水解成α-二醇基团的方法，其特征在于：（1）反应温度为130℃至200℃ ℃; （2）反应混合物每100份树脂重量含有0.5至10份水; 和（3）混合物含有0至1重量％的有机溶剂和0至100ppm的有机酸，有机二酸，鏻化合物和碱金属或碱土金属及其盐。 该方法提高了树脂中的α-二醇基团的水平，但不使用溶剂或催化剂，因此容易清除所得树脂。

    LOW MOLECULAR WEIGHT ALKENYL AROMATIC POLYMER FOAM
    97.
    发明申请
    LOW MOLECULAR WEIGHT ALKENYL AROMATIC POLYMER FOAM 审中-公开
    低分子量亚苄基芳族聚合物泡沫

    公开(公告)号：WO1995010560A1

    公开(公告)日：1995-04-20

    申请号：PCT/US1994010491

    申请日：1994-09-16

    Applicant: THE DOW CHEMICAL COMPANY ,  PAQUET, Andrew, N. ,  GRIFFIN, Warren, H.

    Inventor： THE DOW CHEMICAL COMPANY

    IPC: C08J09/12

    CPC classification number: C08J9/127 ,  C08J9/12 ,  C08J2203/12 ,  C08J2203/14 ,  C08J2203/142 ,  C08J2325/02

    Abstract: Disclosed is a foam structure of desirable mechanical strenght made with a low molecular weight alkenyl aromatic polymer material and an inorganic blowing agent. The polymer material has an alkenyl aromatic polymer of a weight average molecular weight of 100,000 to 165,000. The foam structure can be made in processes with reduced pressure drop.

    Abstract translation: 公开了一种使用低分子量链烯基芳族聚合物材料和无机发泡剂制成的理想机械强度的泡沫结构。 聚合物材料具有重均分子量为100,000至165,000的链烯基芳族聚合物。 泡沫结构可以在压降降低的过程中制成。

    PROCESS FOR PRODUCING A HIGH MOLECULAR WEIGHT EPOXY RESIN
    98.
    发明申请
    PROCESS FOR PRODUCING A HIGH MOLECULAR WEIGHT EPOXY RESIN 审中-公开
    生产高分子量环氧树脂的方法

    公开(公告)号：WO1995010556A1

    公开(公告)日：1995-04-20

    申请号：PCT/US1994011349

    申请日：1994-10-06

    Applicant: THE DOW CHEMICAL COMPANY ,  OGIWARA, Toshiaki

    Inventor： THE DOW CHEMICAL COMPANY

    IPC: C08G59/06

    CPC classification number: C08G59/066

    Abstract: The present invention provides a process for producing a high molecular weight epoxy resin by polymerizing an epoxy resin having an average epoxide group number of two per molecule with a divalent phenol compound in the presence of a glycol ether having no hydroxyl group in alpha -position as a solvent. The preferable glycol ethers used in the present invention include propyleneglycol ethers such as propyleneglycol methylether, propyleneglycolmethylether acetate, propylenepglycol propylether and propyleneglycol monobutylether.

    Abstract translation: 本发明提供一种高分子量环氧树脂的制造方法，其通过在α位没有羟基的二醇醚的存在下，将每分子具有2个平均环氧基数的环氧树脂与二价酚化合物进行聚合， 溶剂。 用于本发明的优选的二醇醚包括丙二醇醚如丙二醇甲基醚，丙二醇甲基醚乙酸酯，丙二醇丙基醚和丙二醇单丁基醚。

    WATER-SWELLABLE POLYMERS HAVING IMPROVED COLOR
    99.
    发明申请
    WATER-SWELLABLE POLYMERS HAVING IMPROVED COLOR 审中-公开
    具有改进颜色的水溶性聚合物

    公开(公告)号：WO1995010553A1

    公开(公告)日：1995-04-20

    申请号：PCT/US1994010559

    申请日：1994-09-16

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  JOHNSON, Thomas, C.

    IPC: C08F261/04

    CPC classification number: C08F261/04 ,  C08F220/06

    Abstract: The subject invention pertains to a water-swellable polymer comprising the polymerization product of an alpha , beta -ethylenically unsaturated monomer in an aqueous phase, initiator, cross-linking agent, and polyvinyl alcohol, the polymerization product having been heated at a temperature greater than 160 DEG C, wherein the polyvinyl alcohol is less than 98 percent hydrolyzed, such that the polymerization product has improved whiteness.

    Abstract translation: 本发明涉及水溶性聚合物，其包含水相中的α，β-烯属不饱和单体的聚合产物，引发剂，交联剂和聚乙烯醇，聚合产物已经在大于 160℃，其中聚乙烯醇低于98％水解，使得聚合产物具有改善的白度。

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