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4837 results about "Chain transfer" patented technology

Chain transfer is a polymerization reaction by which the activity of a growing polymer chain is transferred to another molecule. Chain transfer reactions reduce the average molecular weight of the final polymer. Chain transfer can be either introduced deliberately into a polymerization (by use of a chain transfer agent) or it may be an unavoidable side-reaction with various components of the polymerization. Chain transfer reactions occur in most forms of addition polymerization including radical polymerization, ring-opening polymerization, coordination polymerization, and cationic polymerization, as well as anionic polymerization.

Trust chain transfer method for trusted computing platform

The invention discloses a trust chain transfer method for a trusted computing platform. A trusted computing module (TCM) serving as a starting point of starting a trust chain is started and actively initiated at first to verify the trustiness of a BIOS (basic input output system) chip; after the trusted BIOS chip is started, a MAIN BLOCK of the BIOS chip performs concentrated integrity verification on key files of an MBR (master boot record), an operating system loader and an operating system kernel; in the starting process of an operating system, the starting and running of an unauthorized program are prevented in a way of combining the integrity verification based on a white list and running program control; and hashing operations for the integrity verification are finished by a hardware computing engine. When a user starts any executable program, a security module in the operating system kernel checks the integrity of the program and checks whether the program is in the trusted program white list or not, and only application programs which are in the trusted program white list of the system and have integrity measures consistent with an expected value are permitted to be run. High-efficiency and fine-grained trust chain transfer is realized, the damages of viruses to system files and program files can be prevented, and the execution of the unauthorized program can be prevented.
Owner:中国人民解放军海军计算技术研究所

Polyether class polycarboxylic acid high-efficiency water reducing agent and preparation method thereof

The invention relates to a polyether class polycarboxylic acid high-efficiency water reducing agent and a preparation method thereof, belonging to the field of concrete materials, structures and engineering of building materials. The polyether class polycarboxylic acid high-efficiency water reducing agent raises the temperature of water solutions of 15-55 mass percent of allyl polyethenoxy ether and 0-6 mass percent of chain transfer agent is raised to 50-90 DEG C, one side is dropwise added with a water solution of 0.01-0.9 mass percent of an evocating agent, one side is dripwise added with miscible liquids of 3-15 mass percent of unsaturated acids and one or more than one derivative thereof, the temperature is kept unchanged, and the water solution and the miscible liquids are completely dropped within 2-6 hours, the temperature is preserved for 1-6 hours and naturally cooled to room temperature, and the mixed solution is neutralized by sig water till a PH value reaches 6.8-7.2 so as to obtain the polyether class polycarboxylic acid high-efficiency water reducing agent. The polyether class polycarboxylic acid high-efficiency water reducing agent and the preparation method thereof have simple technique, low cost and good property, can effectively reduce the water-cement ratio of concrete, improves the compaction rate of a pore structure of the concrete, enhances the strength and the durability of the concrete and has great significance on enhancing the engineering quality, prolonging the service life, reducing the engineering cost, reducing the environment pollution, and the like.
Owner:大连华健科技有限公司

Polymers of ethylene and, optionally, copolymerizable esters, films using such polymers and stretch hood packaging processes using such films

The invention relates to a polymer comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester, c) a density of from 0.90 to 0.94 g/cm3, preferably 0.91 to 0.935 g/cm3, especially 0.92 to 0.93 g/cm3 as determined by ASTM D1505, and d) a relaxation time as described herein of at least 10 s. Such polymers are obtainable by polymerization by free radical polymerization using a chain transfer agent that incorporates into the polymer chain such as an alpha-olefin, preferably propylene, as a chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down stream part of the tubular reactor.
The polymer may be used for stretch hood film, preferably as a blown film coextruded tube comprising: a) a core of the above polymer; and b) a skin layer, on each side of the core which may be of the same or different composition, comprising at least 60 wt % of an LLDPE having density of 0.91 to 0.94 g/cm3 as determined by ASTM-D 1238 Condition E and hexane extractables less than 1.5 wt %, said skin layer containing less than 7500 ppm of anti-block particulates and said film having an elastic recovery after a 100% stretch of at least 40% and providing a normalized holding force per 100 μm thickness pre-stretch at 85% stretch after an initial stretch of 100% of at least 20 N/50 mm at a deformation rate of less than 10% of the starting length per second.
Owner:EXXONMOBIL CHEM PAT INC

Hydroxy acrylic resin aqueous dispersion and water-based coating prepared therefrom

The invention discloses a method for preparing a hydroxy acrylic resin aqueous dispersion and the hydroxy acrylic resin aqueous dispersion prepared by the same and water-based coating using the hydroxy acrylic resin aqueous dispersion as a film forming matter. The hydroxy acrylic resin aqueous dispersion is prepared by a step free radical solution polymerization process and obtains a nucleus-shell structure by using an initiator of a specific type and a chain transfer agent and by a high-temperature polymerization reaction. The nucleus has weak hydrophilicity and no carboxyl, and the shell has a strong hydrophilicity and is rich in carboxyl, so stable storage can be realized. The obtained hydroxy acrylic resin aqueous dispersion has the characteristics of low solution content, high solid content and low viscosity. The coating prepared from the hydroxy acrylic resin aqueous dispersion and a water-based amino resin or a water-based polyurethane cross-linking agent has the characteristics of high brightness, good water resistance and excellent weather resistance. The hydroxy acrylic resin aqueous dispersion can be used for preparing an excellent base material of high-performance environment-friendly industrial protective coatings and widely applied to topcoats and primer-topcoat coatings in various fields.
Owner:LANGFANG JINHUILI INDAL PAINT

Preparation method of anti-mud polycarboxylic water reducer

ActiveCN103467670AGuarantee water reduction and slump protectionEnhanced steric hindranceDistillationCarboxylic acid
The invention relates to an anti-mud polycarboxylic water reducer and a preparation method thereof and belongs to the field of water reducers. The preparation method of the water reducer comprises the steps of (1) preparing quaternary ammonium salt oligomer: allowing epibromohydrin and tertiary amine compound aqueous solutions to react by the action of a composite initiator in a mixed solvent of low alcohol and water when a system pH (potential of hydrogen) value is 1-2, then performing reduced pressure distillation, and obtaining light yellow viscous quaternary ammonium salt oligomer, and (2) preparing the anti-mud polycarboxylic water reducer, performing radical copolymerization on quaternary ammonium salt oligomer, isopentene alcohol ethoxylate, amino trimethylene phosphonic acid, unsaturated monocarboxylic acid and a derivative of unsaturated monocarboxylic acid by the action of an initiator and a chain transfer agent to form the colorless to light yellow transparent polycarboxylic water reducer. An adverse effect of a mud content of aggregate in concrete on the polycarboxylic water reducer can be avoided, and the problems of insufficient water reduction, great slump loss and lower strength of the concrete are solved on the premise that the mixing amount of the polycarboxylic water reducer is not increased.
Owner:NANJING RUIDI HIGH TECH
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