摘要:
The invention relates to heat treatment of polymorphic semicrystalline or crystallizable polymers to increase the content of the highest melting crystalline form. Such heat treatment results in a polymer powder that has a consistent, uniform melting range, improved flow and improved durability of the powder particle size for applications that require powder flow at elevated temperatures. In addition to improved powder properties, the articles produced from the powders also exhibit better physical properties in both appearance and in mechanical properties. Thus the invention also includes polymer powders and articles produced by the described processes.
摘要:
A component comprises a first part and a second part, wherein said second part is in contact with said first part, wherein: (i) said first part comprises a first polymer which is semi-crystalline and includes phenylene moieties, carbonyl moieties and ether moieties; (ii) said second part comprises a second polymer which is semi-crystalline and includes phenylene moieties, carbonyl moieties and ether moieties; (iii) the melting temperature (Tm) of the second polymer is less than the melting temperature (Tm) of the first polymer. In a preferred embodiment, said first polymer is polyetheretherketone and said second polymer is a copolymer having a repeat unit of formula VIII and a repeat unit of formula IX.
摘要:
A thermoplastic resin composition of which the molding efficiency can be improved by a high flowability and a high crystallization temperature while ensuring desired physical properties (e.g., strength) in a molded product, and a molded product of the composition are provided. The thermoplastic resin composition comprises a plurality of thermoplastic resins having a melt viscosity different from each other and containing a unit which comprises an arylene group and an ether group and/or a carbonyl group; when the thermoplastic resin composition at least comprises a first thermoplastic resin having a melt viscosity of 150 to 1500 Pa · s at a temperature of 400°C and a shear rate of 1216 s -1 , and a second thermoplastic resin, and the melt viscosity ratio of the first thermoplastic resin relative to the second thermoplastic resin at a temperature of 400°C and a shear rate of 1216 s -1 [the former/the latter] is 1.5/1 to 10/1, the resin composition has a flowability and mechanical properties compatible with each other and an increased crystallization temperature, and shortens the molding cycle.
摘要:
The present invention provides an adhesive composition comprising a copolymer (a) of a methylmethacrylate (MMA) and/or a butylmethacrylate (BMA) and a styrene (St), also provides an adhesive composition comprising a mixture of an acrylic polymer (b) and a ketone resin, wherein the acrylic polymer (b) is at least one polymer selected from the group consisting of a poly MMA, a poly BMA, a MMA/BMA copolymer or a MMA/BMA/St copolymer, and also provides a thermal transfer sheet having a layer comprising the adhesive composition. The adhesive composition has excellent heat sealing characteristics and resistance to blocking when it is used for the formation of an adhesive layer, is also superior in miscibility with various organic or inorganic additives and allows these additives to exhibit their functions sufficiently when these additives are added and has high transparency.
摘要:
Provided is a resin composition capable of giving a molded article that has a low coefficient of kinetic friction and a high limiting PV value. The resin composition comprises an aromatic polyether ketone resin (I), and a fluororesin (II), the fluororesin (II) being a copolymer of tetrafluoroethylene and a perfluoroethylenic unsaturated compound represented by the following formula (1): €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒCF 2 =CF-R f 1 €ƒ€ƒ€ƒ€ƒ€ƒ(1) wherein R f 1 represents -CF 3 or -OR f 2 , and R f 2 represents a C1 to C5 perfluoroalkyl group; the composition comprising the aromatic polyether ketone resin (I) and the fluororesin (II) at a mass ratio (I):(II) of 95:5 to 50:50; the fluororesin (II) being dispersed as particles in the aromatic polyether ketone resin (I) and having an average dispersed particle size of 3.0 µm or smaller.
摘要:
Provided is a resin composition capable of giving a molded article that has a low coefficient of kinetic friction and a high limiting PV value. The resin composition comprises an aromatic polyether ketone resin (I), and a fluororesin (II), the fluororesin (II) being a copolymer of tetrafluoroethylene and a perfluoroethylenic unsaturated compound represented by the following formula (1):
CF 2 =CF-R f 1 (1)
wherein R f 1 represents -CF 3 or -OR f 2 , and R f 2 represents a C1 to C5 perfluoroalkyl group; the composition comprising the aromatic polyether ketone resin (I) and the fluororesin (II) at a mass ratio (I):(II) of 95:5 to 50:50; the fluororesin (II) being dispersed as particles in the aromatic polyether ketone resin (I) and having an average dispersed particle size of 3.0 µm or smaller.
摘要翻译:本发明提供能够提供具有低动力摩擦系数和高限制PV值的成型体的树脂组合物。 树脂组合物包含芳族聚醚酮树脂(I)和氟树脂(II),氟树脂(II)是四氟乙烯和由下式(1)表示的全氟烯属不饱和化合物的共聚物:€ƒ€ƒ€ ƒ€ƒ€ƒ€ƒCF2 = CF-R f 1€ƒ€ƒ€ƒƒ(1)其中R f 1表示-CF 3或-OR f 2,R f 2表示 C1〜C5全氟烷基; 所述组合物的质量比(I):(II)为95:5〜50:50的芳族聚醚酮树脂(I)和所述氟树脂(II) 氟树脂(II)作为颗粒分散在芳族聚醚酮树脂(I)中,平均分散粒径为3.0μm以下。
摘要:
Wood and other cellulose-based products are preserved with a water-based treating solution containing a phenolic resin prepolymer such as phenol formaldehyde resin prepolymer, a resorcinol formaldehyde resin prepolymer and water. The treatment is carried out by exposing the wood or other cellulose-based product, while submerged in the treating solution, to one or more cycles of reduced pressure (i.e. vacuum) and elevated pressure.