摘要:
The present invention relates to modelling doughs comprising; a) at least one starch-containing material; b) at least on low vapour pressure polar solvent; and c) an aqueous component. Typically the doughs will also contain optional ingredients such as softeners, preservatives and/or additives. The invention further relates to filled doughs comprising the modelling doughs incorporating an inert filler and to methods for the production of both the modelling dough and the filled dough.
摘要:
Polymers, hydrogels, and thermochromic agents, including products embodying them, methods of using them, and processes for making them. In certain embodiments, temperature therapy packs which utilize thermochromic agents integrated into solid, semi-solid, or liquid hydrogels. In preferred (but optional) embodiments, the thermochromic agents are integrated into the composition used as the temperature exchange material of the therapy pack. In certain other embodiments, methods of using the thermochromic integrated temperature exchange materials, or processes for manufacturing such thermochromic integrated temperature exchange materials and/or methods or processes for manufacturing or using thermal packs embodying such materials. In certain particularly preferred embodiments, novel polymer compositions and/or processes for making polymers, which improve product durability or longevity and/or which improve use cycles or usage times.
摘要:
The present invention relates to a thermoplastic composition, in particular for use in extrusion and compounding, having a continuous phase, which comprises at least one first polymer, which is selected from a group comprising a polyester, a polyesteramide, a polyesteretheramide, an aliphatic or partially aromatic polyester urethane or mixtures thereof, in particular such compounds or mixtures having hydrophobic surface properties, and at least one dispersed phase, which, as the second polymer, comprises at least one biogenic crosslinking agent having a water content of 0.1 to 30 wt. %, in particular 5 to 25 wt. %, with reference to the total weight thereof, and wherein the first polymer of the continuous phase is not miscible with the second polymer of the dispersed phase, and has at least one inorganic filler, and at least one plasticizer. The composition according to the invention is characterized in that it has the plasticizer diglycerol or mixtures with diglycerol, and the filler is in a proportion of 0.1 to 40 wt. % with reference to the total weight of the composition.
摘要:
A mixed PTFE powder according to the present invention is prepared by the steps of preparing a PTFE mixed dispersion by dispersing MoS2, Al2O3, and Al(OH)3 in a PTFE emulsion; dehydrating the PTFE mixed dispersion by adding Na2CO3 into the PTFE mixed dispersion to form a cake type compound; preparing an ingot by drying the cake type compound for about 16 to 24 hours at the temperature of about 120 to 190° C.; and pulverizing the ingot in a 30-35 mesh vibrating net. An HDME PTFE yarn according to the present invention is prepared by the steps of preparing the mixed PTFE powder; adding kerosene of about 18 to 25 wt. % as solvent to the mixed PTFE powder and maintaining the resultant for about 40 to 50 hours at the temperature of about 30 to 50° C.; extruding the resulting mixed PTFE into the form of rod at about 70 to 90° C.; calendering the rod into the form of sheet at about 100 to 150° C., the width of the sheet being about 100 to 300 mm and the thickness about 0.3 to 0.7 mm; folding the sheet to become a three layered sheet and passing through the three layered sheet in an oven of about 250 to 270° C. at a speed of about 10 to 40 cm per second; and drawing the three-layered sheet at the temperature of about 450 to 500° C. at the speed of about 30 to 100 cm/s and the drawing ratio of about 200 to 600%.
摘要:
A biodegradable polymer includes a) 20 to 60% of a mixture of starch and/or a modified starch, b) 8 to 22% of starch plasticisers and processing agents c) 30 to 70% of one or more biodegradable aliphatic polyesters d) 1 to 10% of a layered silicate clay mineral. The silicate mineral is an organoclay which has been formed by reacting clay with an intercalating chemical to compatibilise it with the polymers so that the clay is exfoliated and makes the blend amorphous. The polymers may also include the usual additives including e) from 0 to 20% by weight of a polyol plasticiser f) from 0.1 to 1.5% by weight of a C12–22 fatty acid or salt or a destructing agent preferably urea and/or urea derivatives, and g) from 0 to 12% by weight of added water. The polyester may be modified by reaction with maleic anhydride.
摘要:
The invention relates to a gel based on poly-α-1,4-D-glucan and, optionally, on starch as well as on a swelling agent, to a method for the production thereof, and to the use of a gel of this type.
摘要:
Chemical biological agents to be encapsulated are blended into an aqueous dispersion of an unmodified starch comprising about 5% to about 25% by weight amylose. The dispersion, having an initial starch solids content of about 20% by weight, is characterized by completely disrupted starch granules and completely disassociated amylose molecules that are not significantly depolymerized. Subsequent drying is accomplished by reassociation of the amylose molecules which converts the dispersion into a protective matrix and binds the agents within the interstices of the reassociating starch chains. Rate of release of agents to the environment can be altered by varying the proportion of amylose in the starch. Encapsulation of biologically active compositions provides protection against degradative environmental conditions, improves safety in handling, and slows the release of such compounds to the surrounding medium.
摘要:
An adhesive composition suitable for application to a paper backing to form an adhesive tape comprising amylose pectin, a medium molecular weight starch, urea, a sugar or sugar alcohol, a neutralized polyacrylate and water. The composition can be applied to one surface of a paper backing to form an adhesive tape suitable to be wound as a roll without premature bonding and without loss of adhesive strength.
摘要:
AQUEOUS SOLUTIONS OF POLYVINYL ALCOHOL CONTAINING AMYLOSE AND/OR AMYLITOL OF LOW MOLECULAR WEIGHT (AVERAGE OR MEANS DEGREE OF POLYMERIZATION 20-30) IN AN AMOUNT F NOT SUBSTANTIALLY MORE THAN 50% OF THE PVA CAN BE DRIED TO FILMS SOLUBLE IN COLD WATER THAT ARE MORE TRANSPARENT AND LESS HYGROSCOPIC THAN FILMS PRODUCED FROM PVA ALONE OR MODIFIED WITH OTHER STARCH DERIVATIVVES, AND ARE VIRTUALLY IMPREMEABLE TO XOYGEN. THE SOLUTIONS MAY ALSO BE EMPLOYED FOR SIZING PAPER AND TEXTILE FIBERS, FOR PRODUCING FIBERS BY DRY SPINNING, AND THE LIKE.