Granular polymer additives and their preparation

A technology of polymers and additives, applied in the direction of special adhesive granulation, etc., can solve the problems of no practicability, affecting the product specifications of polymer products, reducing the performance of main polymers, etc., and achieving the effect of wide practicability

Inactive Publication Date: 2004-04-28
ALBEMARLE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these methods require the use of additional components to act as binders, which are undesirable in the final polymer composition and may affect the product specifications of the polymer product
In addition, the use of the aforementioned binders may degrade the performance of the primary polymer
and the range of additives capable of being transformed into granules or spheres in some cases is quite specific and thus not of widespread utility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0089] Cylindrical particles are easier to prepare and are therefore preferred. However, instead of using molded plates to produce cylindrical granules, other granulation methods can be used. For example, a Marumerizer (LCI Corporation) can be used to convert cylindrical particles to spherical particles. The above-mentioned preferred, more preferred, and most preferred cross-sectional areas of extruded particles obtainable using this method.

[0090] Typical granules prepared by the method of the present invention have the advantage of extremely low dust forming properties. However, since the granulation process itself in some cases produces some broken particles or other dust-causing powders, in this case it is desirable to remove particles smaller than 0.25 mm. This can be achieved by sieving the dried particles through a sieve having 0.25 mm openings, such as a US Standard No. 60 sieve. Other methods suitable for classifying the particles to remove these small particles ...

Embodiment I

[0106]4.54 kg (10 lbs) of tris(2,4-di-tert-butylphenyl)phosphite (IRGAFOS 168 powder; Ciba Specialty Chemicals Corporation) and 0.59 kg (1.30 lbs) of cyclohexane were mixed and stirred for 6 minutes to obtain Homogenous mixture. The mixture is processed into cylindrical granules through the following steps: 1) the mixture is supplied to the KAHL type 14-175 tablet machine at a speed of 26.31~30.80kg / hr (58~68lbs / hr), and this tablet machine is equipped with a tablet machine with a diameter of 3mm. 2) Collect the output of the tablet machine in a stainless steel pan; 3) Dry in a forced-air oven at 105°C under nitrogen Produce material for 12 hours; 4) Dry sieve the dried material with a US Standard No. 8 sieve to remove process fines (ie, particles small enough to pass through a No. 8 sieve). The yield of the final product was about 83%, which contained cylindrical particles, typically 3 mm in diameter, with a particle compression hardness of 2.32-2.50 kg / cm (13-14 lbs / hr) (co...

Embodiment II

[0108] Sodium benzoate powder (4.35 kg [9.60 lbs] of 44 micron low dust grade from Total Specialty Chemicals), 2.18 kg (4.80 lbs) of DHT-4A hydrotalcite powder (from Kyowa Chemical Industry Co., Ltd) and 0.73 g (1.60 lbs) of IRGAFOS 168 phosphite powder (from Ciba Specialty Chemical) was mixed and tumbled for 6 minutes. The processing solvent (1.09 kg [2.40 lbs] of cyclohexane) was added to the powder mixture and agitated mixing was carried out for 6 minutes to obtain a homogeneous mixture of manufactured particles. The granulation operation used a KAHL model 14-175 tablet machine equipped with a platen with a 3 mm diameter hole and a 10.5 mm stroke length and operated at a rotation speed of 100 rpm. The mixture was fed to the tablet machine at a rate of 11.79 kg / hr (26 lbs / hr) using a twin screw volumetric feeder. The output of the tablet machine was collected in a stainless steel pan and the product was dried in a forced air oven at 105°C under nitrogen for 1.5 hours to eva...

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Abstract

A compacted particulate polymer additive composition in a dry granular form formed from the following components: (a) at least one particulate organic phosphite, organic phosphonite, and / or organic phosphonate, and (b) one or more particulate polymer additives other than an organic phosphite, organic phosphonite, or organic phosphonate; wherein the particles of said composition are held together in compacted dry granular form exclusively or substantially exclusively by contact with dried surfaces of in situ desolvated particles from particles of one or more at least partially solvated components of (a), and optionally by contact with dried surfaces of in situ desolvated particles from particles of one or more at least partially solvated components of (b). Compositions of this type except that there is no component (b) are also described.

Description

technical field [0001] The present invention relates to improved polymer additive products, ie, granular additives for use in polymers, wherein the additive is present in particulate form, such as pellets. Background technique [0002] A variety of particulate additives are used in thermoplastic polymers to enhance the properties of the polymers and / or to increase the utility of products formed from such polymers. For example, these types of particulate polymer additives are used as antioxidants, flame retardants, flame retardant enhancers, heat stabilizers, UV stabilizers, nucleating agents, acid neutralizers, or polymer clarifiers. To facilitate the mixing operation, it is desirable to provide the additives in granular form because many additives tend to form lumps or holes in the hopper and / or are not uniformly fed through the metering equipment. In addition, certain additives, especially fine particle size additives, often used in the preparation of polymers such as hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00B01J2/28C08K5/51C08K5/524
CPCB01J2/28C08K5/51C08K5/524C08K5/53
Inventor 约翰西曼
Owner ALBEMARLE CORP
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