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61 results about "Increased stress" patented technology

Coloured composition with increased stress cracking resistance

The invention relates to a composition containing, in relation to the total weight of said composition, A) between 50.0% by weight and 99.5% by weight of at least one (meth)acrylate (co)polymer and B) between 0.5% by weight and 50.0% by weight of at least one copolymer, obtained by the polymerisation of a monomer mixture consisting of i. between 70% by weight and 92% by weight of a vinyl aromatic monomer and ii. between 8% by weight and 30% by weight of acryl nitrile or methacryl nitrile or mixtures thereof iii. between 0% by weight and 22% by weight of at least one other monomer, the composition having at 50° C. a ΔE of less than 0.15, ΔE being defined according to the relationship (1): (1) in which ΔL*: the modification of the colour co-ordinates L* compared with the colour co-ordinates L* at 23° C., Δa*: the modification of the colour co-ordinates a* compared with the colour co-ordinates a* at 23° C., Δb*: the modification of the colour co-ordinates b* compared to the colour co-ordinates b* at 23° C., and the composition contains at least one (meth)acrylate (co)polymer a) with a solution viscosity in chloroform at 25° C. (ISO 1628 part 6) greater than 55 ml/g. The moulded bodies that can be obtained from the composition are characterised in particular by improved stress cracking resistance and are suitable in particular for use in coatings, paints or films.
Owner:EVONIK ROEHM GMBH

Production method for producing shock toughness of pipe coupling material of hot rolled oil well

The invention discloses a production method for producing shock toughness of pipe coupling material of a hot rolled oil well. The method comprises the steps of: heating pipe blanks at the temperature of 1250-1280 DEG C, punching at the temperature of 1200-1250 DEG C, and continuously rolling at the temperature of 980-1100 DEG C; quickly cooling to 850-950 DEG C with water after rolling; and then carrying out temperature equilibrium on steel pipes; pressing the steel pipes subject to temperature equalization in a sizing and reducing rolling mill at the temperature of 40-140 DEG C above Ar3; quickly cooling the steel pipes subjected to sizing to the temperature of Ar1 to 70 DEG C above Ar1; and finally, moving the steel pipes to a cooling bed for air cooling. After being continuously rolledand deformed, the steel pipes are quickly cooled with water to an austenite area with lower temperature to inhibit the growth of the crystallized austenite grains; in addition, the two-stage type cooling is carried out after sizing, the increased stress even deformation in the steel pipes caused by the one-stage type forced cooling of the final rolling can be avoided, the recrystallized austenite, the final ferrite and pearlite are fined, the toughness and strength of the steel pipes are both enhanced and the quality rate of the product is enhanced from 43.6% to more than 99%.
Owner:ANGANG STEEL CO LTD

Coloured composition with increased stress cracking resistance

The invention relates to a composition containing, in relation to the total weight of said composition, A) between 50.0% by weight and 99.5% by weight of at least one (meth)acrylate (co)polymer and B) between 0.5% by weight and 50.0% by weight of at least one copolymer, obtained by the polymerization of a monomer mixture consisting of i. between 70% by weight and 92% by weight of a vinyl aromatic monomer and ii. between 8% by weight and 30% by weight of acryl nitrile or methacryl nitrile or mixtures thereof iii. between 0% by weight and 22% by weight of at least one other monomer, the composition having at 50° C. a ΔE of less than 0.15, ΔE being defined according to the relationship (1): (1) in which ΔL*: the modification of the color co-ordinates L* compared with the color co-ordinates L* at 23° C., Δa*: the modification of the color co-ordinates a* compared with the color co-ordinates a* at 23° C., Δb*: the modification of the color co-ordinates b* compared to the color co-ordinates b* at 23° C., and the composition contains at least one (meth)acrylate (co)polymer a) with a solution viscosity in chloroform at 25° C. (ISO 1628 part 6) greater than 55 ml / g. The molded bodies that can be obtained from the composition are characterized in particular by improved stress cracking resistance and are suitable in particular for use in coatings, paints or films.
Owner:EVONIK ROEHM GMBH
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