Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-01-07
1996-04-16
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524381, C08K 517
Patent
active
055083293
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a stabilised polymer composition containing a polymer of carbon monoxide and one or more olefins. In particular the invention relates to compositions containing such polymers which exhibit good melt processing stability in processes during which the composition is melted and subsequently solidified.
The preparation of random copolymers comprised of a minor mount of carbon monoxide and a major mount of ethylene by catalysed radical polymerisation has been known for some years. More recently it has been found that linear alternating polymers of carbon monoxide and one or more olefins, hereafter called polyketones, can be prepared by contacting the reactants with a Group VIII metal catalyst preferably comprised of palladium and a bidentate phosphine, see for example EP 121965.
The polyketones prepared by this process, whilst being thermoplastics, suffer from the disadvantage that they have relatively high melting points which are close to the temperatures at which they undergo chemical degradation. This causes a problem since the materials are thus difficult to process using conventional melt technology.
In order to overcome this problem a number of potential approaches have been explored. EP 213671 teaches that polyketones comprised of carbon monoxide, ethylene and alpha olefin (e.g. propylene) units have lower melting points than corresponding copolymers comprised only of carbon monoxide and ethylene units. Whilst this approach goes some way to alleviating the problem, there is still a need to improve further the melt processing stability of polyketones if they are to be processed on a commercial scale.
Methods of further improving melt processability have centred around a) the blending of polyketones with other polymers, b) the addition of plasticisers and c) the use of additives claimed to interfere with the degradation reactions which the polyketones undergo. The first two types of approach suffer in that relatively large amounts of the second polymer or plasticiser are required, a consequence of which is that there is a general deterioration in the physical, mechanical and barrier properties of the polyketone. An example of the third type of approach is disclosed in EP 310166. This patent teaches the addition of an aluminium alkoxide or a derivative thereof. Examples of preferred additives are those having the general formula Al(OR).sub.3 where each R is independently C.sub.1 to C.sub.12 alkyl. A disadvantage of this approach is, however, that it has only limited effectiveness. For example, we have found that whilst there is a stability increase in using up to 2% of such materials with the polyketones, there is no substantial further benefit obtained when higher levels were used.
It has now been found that the melt processability of polyketone blends containing an aluminium alkoxide can be improved further by addition of an additive comprising a C.sub.12 to C.sub.20 amine.
According to the present invention there is provided a polymer composition stabilised against degradation during melt processing which comprises (a) a major amount of a polymer of carbon monoxide and at least one olefin, (b) a minor amount of a first stabiliser comprising an aluminium trialkoxide or an aluminium containing hydrolysis product thereof and (c) a minor amount of a second stabiliser comprising an aliphatic amine, preferably C.sub.12 to C.sub.20 aliphatic amine.
Furthermore, it has been found that the reaction product obtainable by reacting an aluminium alkoxide with an amine, preferably a C.sub.6 to C.sub.20 amine can also be used to improve the melt processability of polyketones.
According to a further aspect of the present invention there is provided a polymer composition stabilised against degradation during melt processing which comprises (a) a major amount of a polymer of carbon monoxide and at least one olefin and (b) a minor amount of a polymer stabiliser characterised in that the polymer stabiliser is the product obtainable by reacting an aluminium alkoxide with an amine, preferably
REFERENCES:
patent: 3361729 (1968-01-01), Takashima et al.
patent: 4104247 (1978-08-01), Kato
patent: 4543440 (1985-09-01), Loomis
patent: 4622072 (1986-11-01), Turner
patent: 4631087 (1986-12-01), Turner
patent: 4761448 (1988-02-01), Kluttz et al.
patent: 4994513 (1991-02-01), Syrier et al.
patent: 5232968 (1993-08-01), Davidson
Dolden John G.
Hodgson Philip K. G.
BP Chemicals Limited
Hoke Veronica P.
LandOfFree
Stabilized polyketone composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stabilized polyketone composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stabilized polyketone composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-325674