摘要:
The present invention relates to polymeric alloys which comprise the reaction product of a mixture of:(a) a polyester resin produced from the precondensation reaction of a diol and a dicarboxylic compound, said polyester subsequently condensed and having an intrinsic viscosity from about 0.13 to about 0.35 dl/g, a glass transition temperature of at least 50.degree. C., an acid number from about 5 to 50;(b) at least one polyepoxide having at least two epoxy groups per molecule; and(c) an unvulcanized rubber.
摘要:
Reinforced elastomeric articles, such as tires, wherein the reinforcement is reticulated bacterial cellulose are provided. Reticulated bacterial cellulose has an average diameter of about 0.1 micron and a substantially infinite aspect ratio. The reinforced article comprises about 2 phr to 10 phr of the cellulose reinforcement.
摘要:
The invention relates to elastomers and articles reinforced with 5 to 30 phr Chitosan particles having a diameter of 0.5 to 75 microns. In an illustrated embodiment, the Chitosan may be modified with an oxygen reactive group or a nitrogen reactive group to make the Chitosan more reactive with an elastomer. Also provided is an economical method of incorporating very fine Chitosan particles into an elastomer matrix. In the method Chitosan is dissolved in an acid and mixed with a coagulating liquid (for coagulating latex), and the mixture of chitosan/coagulating liquid is mixed with a latex solution to provide an elastomer/chitosan composite. The elastomer/chitosan composite may be used as formed or it can be used as a masterbatch and mixed with more elastomer.
摘要:
The present invention relates to sulfur vulcanized elastomers containing aramid-polydiene copolymers. When compounded with the elastomers, the aramid-polydiene copolymers improve the reinforcing nature of the elastomers.
摘要:
The present invention relates to a process for the preparation of epoxidized synthetic cis-1,4-polyisoprene. The process involves reacting the synthetic cis-1,4-polyisoprene in a C.sub.5 -C.sub.7 aliphatic hydrocarbon with tertiary butyl hydroperoxide in the presence of a molybdenum catalyst at a reaction temperature ranging from about 20.degree. C. to about 100.degree. C. The molybdenum catalyst is prepared by reacting together under a N.sub.2 atmosphere molybdenum pentachloride with a carboxylic acid of the formula:CH.sub.3 (CH.sub.2).sub.n COOHwherein n is an integer ranging from 8 to 28. The molar ratio of molybdenum pentachloride to the carboxylic acid ranges from about 1:1 to 1:3.
摘要:
The subject invention relates to comb polymers having a halobutyl rubber backbone and to techniques for synthesizing such polymers. The comb polymers of this invention can be thermoplastic elastomers. For instance, halobutyl rubbers having sidechains which are derived from vinyl aromatic monomers are thermoplastic elastomers which can be made by a technique of the subject invention. Such thermoplastic elastomers typically have a chlorobutyl rubber backbone and side chains which are comprised of polystyrene. The subject invention more specifically discloses a process for grafting a lithium terminated vinyl aromatic polymer onto a halobutyl rubber which comprises: (1) capping the lithium terminated vinyl aromatic polymer with a diene monomer to produce a lithium terminated diene capped vinyl aromatic polymer, and (2) reacting the lithium terminated diene capped vinyl aromatic polymer with the halobutyl rubber to produce a halobutyl rubber having vinyl aromatic sidechains grafted thereto.
摘要:
It is desirable to increase the modulus of rubbers utilized in a wide variety of applications. This invention discloses a technique for modifying rubbers to improve their modulus without sacrificing other properties. The subject invention more specifically relates to a process for preparing a rubber composition having a high modulus which comprises reacting at least one epoxidized rubber with from about 2 phr to about 55 phr of at least one nylon at a temperature which is within the range of about 140.degree. C. to about 300.degree. C.
摘要:
There is disclosed an aqueous medium comprising water to which has been added a water thickening amount of a water thickening polymer which is prepared by polymerizing at least one alkyl acrylate monomer and at least one carboxylic polymerizable monomer selected from the group consisting of acrylic acid and methacrylic acid which are present from 20 to 95 parts by weight per hundred parts of total monomer being polymerized and utilizing, as an ionic emulsifier, an emulsifier selected from the group consisting of disodium or diammonium nonylphenoxy polyethoxy sulfosuccinate having the general formula:CH.sub.3 (CH.sub.2).sub.8 C.sub.6 H.sub.4 O(CH.sub.2 CH.sub.2 O).sub.8-16 COCH.sub.2 CH(COOM)SO.sub.3 Qwherein Q is sodium or ammonium and a sodium or ammonium lauryl polyethoxysulfate having the general formula:CH.sub.2 (CH.sub.2).sub.11 O(CH.sub.2 CH.sub.2 O).sub.8-16 SO.sub.3 Qwherein Q is sodium or ammonium, said polymer in latex form being neutralized to a pH ranging between a pH of 5.5 to 11.5. Such polymers may also be gelled with water soluble polyvalent compounds such as sodium dichromate and water soluble reducing agents such as sodium hydrosulfite. The aqueous gels are employed in enhanced oil recovery.
摘要:
Sheeting which is flexible and tear resistant, and optionally clear and transparent, is prepared from resins prepared by grafting PVC-type polymers with a combination of an acrylic ester such as methyl acrylate and an acrylic nitrile such as acrylonitrile.
摘要:
A pneumatic tire is provided having good rolling resistance properties without sacrificing traction. The tire has a tread that contains 2 to 15 phr thermoplastic reinforcing polymer as a replacement for 5 to 25 phr carbon black.