Abstract: To provide an ETFE film which is unlikely to wrinkle when stretched and retracted, and a method for producing the same. It is an ethylene-tetrafluoroethylene copolymer film characterized in that the crystallinity obtained by the formula (1) from the peak area S20 in the vicinity of 2?=20°, the peak area S19 in the vicinity of 2?=19° and the peak area S17 in the vicinity of 2?=17° in the diffraction intensity curve obtained by the X-ray diffraction method, is from 55 to 70%, and the proportion of the quasi-crystal layer obtained by the formula (2) is from 10 to 20%: crystallinity (%)=(S19+S2)/(S17+S19+S20)×100??(1) proportion of quasi-crystal layer (%)=S20/(S17+S19++S20)×100??(2).

Abstract: To provide an ETFE film which is unlikely to wrinkle when stretched and retracted, and a method for producing the same.

Abstract: A novel perfluoropolyether derivative which is less likely to undergo decomposition, which is free from a problem of deterioration during its use, and which is useful as a lubricating oil or a coating agent, is provided. A compound represented by the following formula (1): HO—(CH2CH2O)r. (CH2CH(OH)CH2O)p—CH2CF2O(CF2CF2O)mCF2CH2O——(CH2CH(OH)CH2O)q. (CH2CH2O)s—H ??Formula (1) wherein m represents an integer of from 3 to 200, and each of p, q, r and s which are independent of one another, represents an integer of from 0 to 100, provided that when each of p, q, r and s which are independent of one another, is an integer of at least 1, the arrangement of —(CH2CH2O)— and —(CH2CH(OH)CH2O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, these units may be arranged in a block form or at random.

Abstract: A novel perfluoropolyether derivative which is less likely to undergo decomposition, which is free from a problem of deterioration during its use, and which is useful as a lubricating oil or a coating agent, is provided. A compound represented by the following formula (1): HO—(CH2CH2O)r•(CH2CH(OH)CH2O)p—CH2CF2O(CF2CF2O)mCF2CH2O—(CH2CH(OH)CH2O)q•(CH2CH2O)s—H??Formula (1) wherein m represents an integer of from 3 to 200, and each of p, q, r and s which are independent of one another, represents an integer of from 0 to 100, provided that when each of p, q, r and s which are independent of one another, is an integer of at least 1, the arrangement of —(CH2CH2O)— and —(CH2CH(OH)CH2O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, these units may be arranged in a block form or at random.

Abstract: A novel perfluoropolyether derivative which is less likely to undergo decomposition, which is free from a problem of deterioration during its use, and which is useful as a lubricating oil or a coating agent, is provided. A compound represented by the following formula (1): HO—(CH2CH2O)r.(CH2CH(OH)CH2O)p—CH2CF2O(CF2CF2O)mCF2CH2O——(CH2CH(OH)CH2O)q.(CH2CH2O)s—H??Formula (1) wherein m represents an integer of from 3 to 200, and each of p, q, r and s which are independent of one another, represents an integer of from 0 to 100, provided that when each of p, q, r and s which are independent of one another, is an integer of at least 1, the arrangement of —(CH2CH2O)— and —(CH2CH(OH)CH2O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, these units may be arranged in a block form or at random.

Abstract: A novel perfluoropolyether derivative which is less likely to undergo decomposition, which is free from a problem of deterioration during its use, and which is useful as a lubricating oil or a coating agent, is provided. A compound represented by the following formula (1): HO—(CH2CH2O)r.(CH2CH (OH)CH2O)p—CH2CF2O(CF2CF2O)mCF2CH2O——(CH2CH(OH)CH2O)q.(CH2CH2O)s—H??Formula (1) wherein m represents an integer of from 3 to 200, and each of p, q, r and s which are independent of one another, represents an integer of from 0 to 100, provided that when each of p, q, r and s which are independent of one another, is an integer of at least 1, the arrangement of —(CH2CH2O)— and —(CH2CH(OH)CH2O)— units is not particularly limited, and when one of r and p is an integer of at least 2 and the other is an integer of at least 1, or when one of q and s is an integer of at least 2 and the other is an integer of at least 1, these units may be arranged in a block form or at random.

Abstract: The present invention provides a production method to effectively obtain a product in a yield equal to or higher than an objective level, by accurately analyzing the amount of a fluorinated ester compound at the time of its production, or by accurately analyzing the consumption amount or the produced amount of the product or the fluorinated ester compound at the time of chemical conversion of the fluorinated ester compound.