Degradable plastic专利检索-阳光控制门，大门和窗户专利检索查询-专利查询网

Degradable plastic

阅读：238发布：2023-10-29

专利汇可以提供Degradable plastic专利检索，专利查询，专利分析的服务。并且Films and containers are made from polymers of butene-1 such as polybutene-1 which contains a small amount of stabilizer whereby the rapid degradation rate of polybutene-1 can be controlled so that it will degrade after predetermined exposure to sunlight. This renders such products especially suited for agricultural mulch films, where they need not be removed after a growing season, and for throw-away containers where they will decompose in garbage dumps or if discarded as litter. The thermal history of the polymer will also affect its degradation rate. The rate is measured in terms of thermally adjusted Langley units (TALU) since it has been found that the ambient temperature affects decomposition as well as the Langley units of solar radiation exposure.，下面是Degradable plastic专利的具体信息内容。

权利要求

1. IN THE GROWING OF AN AGRICULTURAL CROP IN A FIELD IN WHICH THE FIELD IS AT LEAST PARTIALLY COVERED WITH A PLASTIC FILM FOR A PREDETERMINED GROWTH PERIOD, THE IMPROVEMENT WHICH COMPRISES ASCERTAINING, FROM THE METERIOLOGICAL DATA FOR THE GEOGRAPHIC AREA IN WHICH SAID FIELD IS LOCATED, THE AMOUNT OF TALU FOR SAID PREDETERMINED GROWTH PERIOD, AND COVERING SAID FIELD WITH A FILM HAVING A THICKNESS UP TO ABOUT 100 MILS AND COMPRISING A POLYMER COMPRISING AT LEAST ABOUT 75% BY WEIGHT OF UNITS OF BUTENE-1, BEING OVER 50% ISOTACTIC AND HAVING A MOLECULAR WEIGHT IN EXCESS OF ABOUT 40,000, AND ABOUT 0.01 TO 5% BY WEIGHT OF A STABILIZER, THE THERMAL TREATMENT OF SAID POLYMER PRIOR THE TIME WHEN IT IS APPLIED TO SAID FIELD AS A FILM HAVING BEEN SUCH AS TO REDUCE ITS INITIAL STABILITY BY AT LEAST ABOUT 5,000 TALU, SAID FILM HAVING A STABILITY APPROXIMATELY THAT OF THE TALU DETERMINED BUT AT LEAST ABOUT 5,000 BUT NOT IN EXCESS OF ABOUT 70,000 TALU, WHEREBY THE FILM WILL DEGRADE AFTER SAID PREDETERMINED GROWTH PERIOD, THE DEGRADATION BEING ACCELERATED OR DECELERATED IN ACCORDANCE WITH AN ACCELERATION OR DECELERATION OF CROP GROWTH DUE TO CLIMATIC CONDITIONS.

1. In the growing of an agricultural crop in a field in which the field is at least partially covered with a plastic film for a predetermined growth period, the improvement which comprises ascertaining, from the meteorological data for the geographic area in which said field is located, the amount of TALU for said predetermined growth period, and covering said field with a film having a thickness up to about 100 mils and comprising a polymer comprising at least about 75% by weight of units of butene-1, being over 50% isotactic and having a molecular weight in excess of about 40,000, and about 0.01 to 5% by weight of a stabilizer, the thermal treatment of said polymer prior to the time when it is applied to said field as a film having been such as to reduce its initial stability by at least about 5,000 TALU, said film having a stability approximately that of the TALU determined but at least about 5,000 but not in excess of about 70,000 TALU, whereby the film will degrade after said predetermined growth period, the degradation being accelerated or decelerated in accordance with an acceleration or deceleration of crop growth due to climactic conditions.

2. The process of claim 1 wherein the film has a stability of at least about 10,000 TALU.

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