Abstract: A chip card is protected against copying by having a data memory for storage of data that are protected, at least in a sub-region of the data memory, against alteration by users or attackers outside of a privileged group. Members of this group can write an individual identifier for this chip card into this protected memory region once, and can write a digital signature of this identifier to an arbitrary memory region of the data memory. The digital signature can be generated with the use of a secret key for which an associated public key exists with which it can be checked whether the digital signature was generated from the individual identifier with the use of a secret key.

Abstract: A disposable clothing is used for protection against liquids or microorganisms, in particular for medicine, chemistry or biotechnology. The clothing comprises, in particular a front part and sleeves (20) connected thereto. The clothing (10) is provided with an external layer (12) in the form of a non-woven air-permeable material. A barrier layer which is selected such that it is air permeable but liquid-proof, is applied to at least the side of the external layer (12) which is oriented towards a person wearing the clothing (10). The barrier layer is, at least in places, connected to the external layer. The non-woven material of the external layer (12) is a laminated material comprising spunbond and meltblown layers.

Abstract: A disposable clothing is used for protection against liquids or micro-organisms, in particular for medicine, chemistry or biotechnology. The clothing comprises, in particular a front part and sleeves (20) connected thereto. The clothing (10) is provided with an external layer (12) in the form of a non-woven air-permeable material. A barrier layer which is selected such that it is air permeable but liquid-proof, is applied to at least the side of the external layer (12) which is oriented towards a person wearing the clothing (10). The barrier layer is, at least in places, connected to the external layer. The non-woven material of the external layer (12) is a laminated material comprising spundbond and meltblown layers.

Abstract: Process for the production of foam boards having a minimum thickness of 20 mm and a cross-sectional area of at least 50 cm.sup.2 by extruding a mixture of the styrene polymer, from 1 to 10% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent contains at least one ether from the group consisting of dimethyl ether, methyl ethyl ether and methyl vinyl ether.