Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymer of an ethylenically unsaturated reactant with a...
Patent
1991-10-31
1994-01-25
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymer of an ethylenically unsaturated reactant with a...
528502, C08G 6702
Patent
active
052816923
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an elongated object made of an orientated alternating copolymer of carbon monoxide and an olefinically unsaturated monomer
EP-A-310,171 discloses an object of this type in which fibres of an alternating copolymer of carbon monoxide, CO, and one or more olefinically unsaturated components are spun from the molten copolymer and orientated by stretching.
Although the tensile strength of these fibres is adequate for a number of applications, the modulus of elasticity remains below the values which with many other polymer fibres are associated with such a tensile strength. It should be noted that EP-A-310.171 only mentions values for the flex modulus of the fibres. This modulus is usually determined on rectangular bars according to methods which are not applicable to fibres, such as ASTM standard D790-86. Although EP-A-310.171 does not specify this, it is most likely that the term `flex modulus` is used for fibres here to indicate that not the initial modulus is stated, but the tangent modulus in the straight part of the curve, as is the case in determination of the flex modulus by said methods, such as ASTM standard D790-86.
Their relatively low flex modulus makes the known fibres unsuitable for applications for which the tensile strength would be adequate but for which a high modulus is necessary. Examples of such applications are the reinforcing component of composite materials and improvement of the impact strength of objects.
The invention now provides an elongated object made of a copolymer of carbon monoxide and an olefinically unsaturated component, the modulus of elasticity of which is at least 16 GPa and preferably at least 22 GPa. More preferably, the tensile strength of the object is at least 1.2 GPa and the modulus of elasticity at least 30 GPa and particularly preferentially these parameters are at least 1.5 GPa and 40 GPa respectively.
For a specific value of the tensile strength, the modulus of the object according to the invention is appreciably higher than in the case of the known orientated objects made from the copolymer.
The invention also provides an elongated object made of a copolymer of carbon monoxide and an olefinically unsaturated component with a high tensile strength, and preferably this tensile strength is at least 2 GPa.
Elongated objects are understood to be objects for which the dimension in at least one direction is appreciably larger than in at least one of the other directions. Examples of such objects are fibres, threads, tapes and films. The objects according to the invention are orientated, for example by stretching, in at least one direction.
An alternating copolymer of carbon monoxide with an olefinically unsaturated component, designated CO copolymer below, is essentially a copolymer which is built up from one unit which is derived from an olefinically unsaturated monomer unit alternating with a carbon monoxide unit. The proportion of each of the components is thus 50 mol %. This is also the maximum possible proportion of the CO units in a copolymer of this type. Within the framework of the invention, if the copolymer consists to the extent of at least 48 mol % of CO units said copolymer is also referred to as an alternating copolymer. As disclosed in EP-A-310,171, the olefinically unsaturated component used can be, for example, ethene, propene and higher alkenes or mixtures thereof. The characteristics of the CO copolymer depend on the olefinically unsaturated monomers used. CO copolymers in which the proportion of ethene in the olefinic part is at least 95 mol % are particularly suitable. Copolymerization of even minor amounts of other olefinically unsaturated monomers, such as, for example, propene, give rise to an appreciable fall in the melting point of the copolymer relative to a copolymer which has the same CO content and in which otherwise only ethene is copolymerized. Preferably, the object therefore consists of a CO-ethene copolymer, which is understood to be a CO copolymer in which only ethene is present as olefinically unsaturated c
REFERENCES:
patent: 4076911 (1978-02-01), Fenton
patent: 5175245 (1992-12-01), Kingensmith et al.
Anderson Harold D.
DSM N.V.
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